Sheet pan dinners are the most forgiving way to eat low FODMAP on a weeknight: one tray, one oven, one wash-up, and complete control over every ingredient that touches your food. That last part matters more than convenience. Most restaurant and packet-seasoned traybakes are built on onion powder and garlic granules — the two ingredients that trigger IBS symptoms fastest for people sensitive to fructans. When you roast at home, you decide.
Every dinner below is garlic-free and onion-free, uses Monash-aligned portions, and roasts on a single tray. Each one lists the oven temperature, the timing, and the portion caps that keep it inside a low FODMAP serve.
Key Takeaways
- One tray, no fructans. Flavour comes from garlic-infused oil, herbs, citrus, ginger, paprika and the green tops of spring onions — never garlic cloves, onion or onion powder.
- Portion caps do the work. Sweet potato (75 g), canned tomatoes (100 g per serve), broccoli heads, capsicum (75 g) and zucchini (65 g) are all low FODMAP at a serve, and high above it.
- Roast dense vegetables first. Potatoes, carrots and parsnips need a 10–15 minute head start before protein and soft vegetables join them.
- Garlic-infused oil is safe because fructans are water-soluble, not oil-soluble — the flavour transfers, the FODMAPs do not.
- Two trays beat one crowded tray. Crowding steams food instead of roasting it, and soggy traybakes are the number one reason people give up on this method.
Before You Start: The Sheet Pan Rules
Line the tray. Baking paper keeps clean-up to seconds and stops delicate fish from tearing.
Preheat properly. A cold tray is the enemy of crisp edges. Give the oven a full 15 minutes at temperature, and preheat the empty tray for 5 of them when you want serious browning on potatoes.
Cut for cooking time, not for looks. Potatoes in 2 cm cubes, carrots in batons, zucchini in thick 1.5 cm rounds. Anything thinner turns to mush before the protein is safe to eat.
Season in a bowl, not on the tray. Tossing vegetables in oil and spice in a mixing bowl coats them evenly; drizzling on the tray leaves half of them bare.
Check the label on every jar. "Natural flavour", "vegetable powder", "stock" and "spice mix" are all common hiding places for onion and garlic. If you are unsure about an ingredient, run it through our FODMAP food checker before it goes in the oven.
Low FODMAP Portion Reference for Traybakes
| Ingredient | Low FODMAP serve | Notes |
|---|---|---|
| White potato | Unlimited | Naturally FODMAP-free, the best traybake base |
| Sweet potato | 75 g | Higher amounts add mannitol |
| Carrot | Unlimited | Sweetens beautifully when roasted |
| Parsnip | Unlimited | Great potato alternative |
| Zucchini | 65 g | Around 1/3 medium zucchini |
| Red capsicum | 75 g | Roughly 1/2 medium pepper |
| Green beans | 75 g | About 15 beans |
| Broccoli (heads only) | 75 g | Stalks are higher in FODMAPs |
| Bok choy | 75 g | Mild, roasts fast |
| Cherry tomatoes | 75 g (about 5) | Common tomatoes are low at a serve |
| Canned tomatoes | 100 g per serve | Cap it, then bulk with stock or water |
| Eggplant | 75 g | Salt and pat dry for best texture |
| Kale | 75 g | Crisps in the last 8 minutes |
| Halloumi | 50 g | Firm cheeses are naturally low in lactose |
| Firm tofu | 170 g | Firm and drained only, never silken |
Full details for hundreds of ingredients live in our low FODMAP foods list.
1. Lemon Herb Chicken Thighs With Potatoes and Carrots
The traybake that converts sceptics. Toss 600 g halved baby potatoes and 3 carrots cut into batons with 2 tablespoons garlic-infused oil, salt, pepper and 1 teaspoon dried thyme, then roast at 200°C (400°F) for 15 minutes. Push the vegetables to the edges, add 4 bone-in chicken thighs rubbed with lemon zest, oil and more thyme, and roast 30–35 minutes until the juices run clear and the skin is deep gold.
Why it works: potato is FODMAP-free, carrot is unlimited, and every gram of flavour comes from citrus and herbs. Finish with lemon juice off the heat so the acidity stays bright. For a stovetop version of the same flavour profile, see our low FODMAP chicken recipes.
2. Maple Mustard Salmon With Green Beans
Whisk 1 tablespoon pure maple syrup with 2 teaspoons Dijon mustard and 1 tablespoon olive oil. Spread 300 g trimmed green beans (75 g per serve) on the tray with a little oil, roast 8 minutes at 200°C (400°F), then nestle in 4 salmon fillets, brush with the glaze, and bake 12–14 minutes.
Pure maple syrup is low FODMAP at 2 tablespoons, so a glaze split across four fillets is comfortably inside a serve — unlike honey, which is high in excess fructose. More on that in our guide to whether maple syrup is low FODMAP, and the full method in our low FODMAP salmon recipe.
3. Garlic-Infused Shrimp With Peppers and Rice
Fifteen minutes, start to finish. Toss 500 g peeled prawns with 2 tablespoons garlic-infused oil, 1 teaspoon smoked paprika and lemon zest. Roast 2 sliced red capsicums (75 g per serve) at 220°C (425°F) for 10 minutes, add the prawns, and roast 6–8 minutes more until just opaque. Serve over plain white rice — naturally FODMAP-free and endlessly reliable, as explained in is rice low FODMAP.
Do not overcook prawns. They go from tender to rubbery in about ninety seconds. Pull the tray the moment they curl.
4. Balsamic Chicken With Zucchini and Cherry Tomatoes
Marinate 4 chicken breasts in 2 tablespoons balsamic vinegar, 2 tablespoons garlic-infused oil, 1 teaspoon dried oregano and pepper for 20 minutes. Roast at 200°C (400°F) with 250 g thick zucchini rounds (65 g per serve) and 300 g cherry tomatoes for 25–28 minutes, until the tomatoes burst and their juices form a light pan sauce.
Balsamic vinegar is low FODMAP at 1 tablespoon per serve, so keep the pour honest. Torn basil at the end is not optional.
5. Sheet Pan Meatballs With Roasted Carrots
Mix 500 g beef mince with 1 egg, 40 g gluten-free breadcrumbs, 2 tablespoons chopped parsley, 1 teaspoon dried oregano, salt and pepper. Roll into 16 balls, arrange on a tray with 4 carrots in chunks tossed in oil, and bake at 200°C (400°F) for 22–25 minutes.
Skip commercial mince blends with "flavour" on the label — they usually contain onion powder. Our full low FODMAP meatballs recipe covers freezing and a safe tomato sauce; pair it with our low FODMAP marinara for a fuller meal.
6. Paprika Pork Chops With Sweet Potato Wedges
Cut 300 g sweet potato into wedges — 75 g per person, which is a genuine serve, not a token amount — and toss with oil, smoked paprika and salt. Roast at 210°C (410°F) for 18 minutes, then add 4 pork chops rubbed with paprika, dried thyme and pepper and cook 14–16 minutes more, resting 5 minutes before serving.
Above 75 g, sweet potato brings enough mannitol to trigger symptoms in sensitive people, so bulk the tray with white potato wedges if 75 g looks small on your plate.
7. Sesame Tofu With Bok Choy
Press 400 g firm tofu for 15 minutes, cube it, toss with 1 tablespoon tamari, 1 tablespoon sesame oil and 1 tablespoon cornflour, then bake at 220°C (425°F) for 20 minutes. Add 300 g halved bok choy brushed with sesame oil for the last 8 minutes and finish with sesame seeds and spring onion greens.
Firm tofu is low FODMAP because the pressing process removes most of the water-soluble GOS; silken tofu is not. Choose tamari over regular soy sauce when you need gluten-free — details in is soy sauce low FODMAP.
8. Rosemary Steak Strips With Parsnips
Roast 500 g parsnip batons in oil, salt and 2 chopped rosemary sprigs at 220°C (425°F) for 20 minutes. Push aside, add 500 g sirloin cut into thick strips tossed in oil and pepper, and roast just 6–8 minutes for medium.
Parsnip is unlimited on the low FODMAP diet and roasts sweeter than potato, which makes it the best-value swap most people have never tried.
9. Sheet Pan Egg and Vegetable Bake
Breakfast-for-dinner that reheats perfectly. Whisk 10 eggs with 60 ml lactose-free milk, salt and pepper. Roast 150 g diced red capsicum and a handful of baby spinach for 8 minutes at 190°C (375°F), pour over the eggs, scatter 60 g grated cheddar, and bake 18–20 minutes until just set. Cut into squares.
Eggs are FODMAP-free and hard cheeses contain almost no lactose, so this one is safe even during the strict elimination phase. See are eggs low FODMAP for the full picture.
10. Sausages With Crispy Kale and Potatoes
Roast 700 g cubed potatoes in garlic-infused oil at 210°C (410°F) for 20 minutes, add 6 gluten-free sausages, roast 15 minutes, then throw 100 g torn kale tossed in oil onto the tray for the final 8 minutes so it crisps rather than wilts.
Sausages are the risk here, not the vegetables. Read the label and choose a plain gluten-free variety with no onion, garlic or dextrose-heavy seasoning. Butchers will often tell you exactly what is in the mix if you ask.
11. Baked Cod With Cherry Tomatoes and Olives
Scatter 300 g cherry tomatoes and 60 g pitted black olives on the tray with olive oil and dried oregano; roast at 200°C (400°F) for 10 minutes. Add 4 cod fillets, season, and bake 12–14 minutes until the fish flakes.
Olives are low FODMAP at 15 green or a similar serve of black, and their salt does the work a stock cube usually would. Serve with rice or a slice of low FODMAP bread to mop the pan juices.
12. Sheet Pan Chicken Fajitas
Make your own seasoning: 2 teaspoons cumin, 2 teaspoons smoked paprika, 1 teaspoon oregano, 1/2 teaspoon chilli powder, salt. Toss with 600 g sliced chicken breast, 2 sliced capsicums (75 g per serve) and 2 tablespoons garlic-infused oil, and roast at 220°C (425°F) for 18–20 minutes. Serve in corn tortillas with lime.
Every packet fajita mix on the shelf contains onion or garlic powder. Making the blend yourself takes forty seconds and is the single highest-impact habit on this list. Our low FODMAP tacos and Mexican beef tacos use the same base.
13. Halloumi With Roasted Eggplant and Capsicum
Toss 300 g cubed eggplant (75 g per serve) and 2 sliced capsicums with 2 tablespoons olive oil and dried oregano; roast at 210°C (410°F) for 22 minutes. Add 200 g sliced halloumi for the final 10 minutes until blistered and golden. Finish with mint and lemon.
A vegetarian traybake with real protein and no legumes — useful when chickpeas and lentils are off the table during elimination.
14. Crispy Gnocchi With Zucchini and Tomatoes
Toss 500 g gluten-free potato gnocchi (straight from the packet, unboiled) with 2 tablespoons garlic-infused oil, 250 g zucchini rounds and 250 g cherry tomatoes. Roast at 220°C (425°F) for 25 minutes, shaking once, until the gnocchi puff and crisp. Finish with parmesan and basil.
Roasting dried gnocchi without boiling gives you a crisp shell and a pillowy centre. Check the packet for wheat and onion powder, then browse more ideas in our low FODMAP pasta recipes.
6 Mistakes That Ruin Low FODMAP Traybakes
- Crowding the tray. Vegetables need air between them or they steam. Use two trays rather than piling one high.
- Adding everything at once. Potatoes need 35 minutes; prawns need 7. Stagger the additions or accept that something will be wrong.
- Trusting a spice blend. Taco seasoning, "roast vegetable" mixes and most stock powders contain onion. Build blends from single spices instead.
- Using garlic cloves "just for flavour" and removing them. Fructans leach into the moisture on the tray. Garlic-infused oil is the only safe route.
- Ignoring portion caps because it is one meal. Stacking 200 g sweet potato with 150 g broccoli and canned tomatoes turns a low FODMAP tray into a high one. This is FODMAP stacking.
- Skipping the rest. Chicken and pork keep cooking off the heat; 5 minutes of rest is the difference between juicy and dry.
Prep-Ahead Strategy
Chop hardy vegetables (potato, carrot, parsnip, capsicum) up to three days ahead and store them in an airtight container in the fridge — potatoes covered in cold water, drained and patted dry before roasting. Mix a jar of your own all-purpose blend (paprika, cumin, oregano, thyme, salt, pepper) so weeknight seasoning takes seconds. Marinate protein in the morning; by dinner it needs nothing but a tray.
If you want the full week mapped out with a shopping list, start from our 7-day low FODMAP meal plan and slot two of these traybakes in as your low-effort nights. For more weeknight options, browse our 25 low FODMAP dinner ideas and the wider low FODMAP dinner recipes collection.
Frequently Asked Questions
Can I use onion or garlic if I remove the pieces before eating?
No. The fructans that cause symptoms are water-soluble and spread through the oil and juices on the tray within minutes. Removing the visible pieces does not remove the FODMAPs. Use garlic-infused oil and the green tops of spring onions instead.
What oven temperature is best for traybakes?
Between 200°C and 220°C (400–425°F). Lower than that and vegetables sweat instead of caramelising; higher and delicate proteins like fish dry out before the vegetables finish.
Are frozen vegetables okay?
Yes, provided they are plain and single-ingredient. Frozen mixes often contain onion. Roast frozen vegetables from frozen at a higher temperature and expect slightly softer results.
How do I stop fish sticking and tearing?
Line the tray with baking paper, oil the fish rather than the paper, and add it partway through so it spends the least possible time in the oven.
Can I meal prep these for lunches?
All of them except the prawn and cod trays reheat well for up to three days. Keep sauces and fresh herbs separate and add them after reheating. See our low FODMAP meal prep guide for storage timings.
Which traybake is best during strict elimination?
The lemon herb chicken, sheet pan egg bake and rosemary steak with parsnips are the simplest — they rely almost entirely on FODMAP-free ingredients with no portion maths.
Save This for Later
Pin this list so you always have fourteen one-tray dinners ready, and use our FODMAP recipe converter to make your own traybake favourites IBS-friendly.
This article is for general information only and is not medical advice. The low FODMAP diet is designed to be short-term and followed with guidance from a registered dietitian, particularly during reintroduction. Always speak to a qualified healthcare professional about your symptoms.
Reviewed by Sarah Mitchell, RDN — Registered Dietitian Nutritionist specialising in digestive health and the low FODMAP diet.
