Simple Roasted Vegetables with Onion
A colorful, caramelized medley of seasonal vegetables roasted until tender and sweet, with crispy onion edges bringing deep flavor. Tossed simply with olive oil, salt, and pepper, this effortless side dish is ready in under 40 minutes and pairs beautifully with almost any main course.
For 4 servings
- prep
Preheat the oven and prepare the baking sheet.
1.Position a rack in the middle of the oven and preheat to 425°F (220°C).2.Line a large rimmed baking sheet with parchment paper.TIPSpread vegetables in a single layer with space between them — crowding steams instead of roasts. - prep
Cut all the vegetables into similar-sized pieces.
1.Cut bell peppers into 1-inch chunks.2.Halve the zucchini lengthwise, then slice into thick half-moons.3.Peel carrots and cut on the diagonal into slices about ½-inch thick.4.Cut the red onion into wedges, keeping a bit of root on each so they stay intact.5.Smash the garlic cloves with the flat side of a knife.TIPAim for uniformly sized pieces so everything roasts at the same rate. - mix
Toss the vegetables with oil and seasonings.
1.Pile all the cut vegetables and garlic onto the prepared baking sheet.2.Drizzle with 2 tablespoons olive oil.3.Sprinkle with 1 pinch salt, 1 pinch black pepper, and the chopped rosemary.4.Toss with your hands until every piece is evenly coated.TIPMassage the oil into the vegetables gently — it helps seasoning stick and promotes better caramelization. - roast · ~15 min
Spread in a single layer and roast for 15 minutes.
Arrange the vegetables in a single layer on the baking sheet, giving each piece a little room. Place in the preheated oven and roast for 15 minutes.
- roast · ~15 min
Flip the vegetables and continue roasting.
1.Remove the baking sheet from the oven.2.Use a spatula to flip the vegetables so the other side can caramelize.3.Return to the oven and roast for another 12 to 15 minutes, until the carrots are fork-tender and the onion edges are crisp and charred in spots.TIPDon't skip flipping — it gives you those beautiful golden-brown edges on both sides. - serve
Serve the roasted vegetables warm.
Transfer the roasted vegetables to a serving platter. Taste and adjust salt and pepper if needed. Serve warm as a side dish alongside grilled chicken, fish, or as part of a grain bowl.
TIPA squeeze of fresh lemon juice just before serving brightens all the flavors.
What to keep in mind.
6 tips from the recipe — small details that make a real difference to the final dish.
- 1Keep the root end intact when cutting onion wedges so they hold together during roasting.
- 2Smash garlic cloves with the flat side of a knife to release flavor without chopping.
- 3Arrange vegetables in a single layer with space between them — crowding steams instead of roasts.
- 4Flip vegetables halfway through for even caramelization on both sides.
- 5A squeeze of fresh lemon juice just before serving brightens all the flavors.
- 6Leftover roasted vegetables keep well in the fridge for 3–4 days; reheat in a hot oven or skillet.
Adapt it for your goals.
Herb swap
Replace rosemary with 1 teaspoon dried thyme or oregano for a different aromatic profile that still complements the roasted vegetables.
low oilLow-oil
Reduce olive oil to 1 tablespoon and use a nonstick baking sheet or silicone mat — the vegetables will still caramelize but with fewer calories.
high proteinHigh-protein
Add 1 cup cooked chickpeas or drained canned chickpeas to the baking sheet during the last 10 minutes of roasting for an extra protein boost.
jainJain
Skip the garlic and substitute the onion with asafoetida (hing) added to the oil — suitable for Jain dietary restrictions.
Why this is on our healthy list.
Rich in Vitamin A
Carrots are packed with beta-carotene, which the body converts into vitamin A for healthy vision and immune function.
High in Fiber
Zucchini, carrots, and bell peppers all contribute dietary fiber, supporting digestion and helping you feel full longer.
Low in Calories
This simple roasted medley is naturally low in calories, making it a light and satisfying side dish.
Antioxidant-Rich Vegetables
Bell peppers and carrots contain antioxidants like vitamin C and beta-carotene that help combat oxidative stress.
Frequently asked questions
Absolutely. Try adding broccoli florets, cauliflower, cherry tomatoes, or cubed sweet potato — just adjust cutting size so everything roasts evenly.
