Roasted Potato Carrot Onion Recipe (Sheet Pan Dinner)

There are days when dinner needs to be quick, comforting, and made with whatever’s left at the bottom of the veggie drawer. You know the ones – work needed “just one quick thing” done just as you headed home, the kids are hungry and melting down, you’ve still got laundry to catch up on so everyone’s got clean underwear tomorrow. Those type of days. And the thought of scrolling recipes online feels like the one thing too many. That’s when I pull out my trusty trio: my potato carrot and onion recipe. Nothing fancy, just old-school root vegetables that have seen generations through solid dinners and busy evenings.

When I first moved out of home, I couldn’t cook. Like, at all! And as worried as my mum was about my lacking culinary skills, she would laugh and say, “If you’ve got carrots, onions, and potatoes, you’ll never go hungry.” She wasn’t wrong. With just these three, you can whip up soups, stews or oven-roasted potatoes. It’s the kind of vegetarian trio that feeds you rustic, filling, and properly homemade meals. Exactly what you want for an exciting main dish or simple side dish.

This particular potato carrot onion recipe is one of those easy options that straddles the line between tradition and practicality. It’s cozy enough for a dinner party with pot roast, but simple enough for weeknight dinners before soccer practice. With just minutes of prep, you can have something roasting away in the warm oven while you get on with the rest of the meal (or life). I love how much flexibility there is, too: baby potatoes, red potatoes, russet potatoes, even sweet potatoes all work beautifully alongside baby carrots or large chunks of sweet carrots of all colours.

So, grab a large bowl, line a baking sheet with parchment paper (or tin foil if you’re out), and let’s chat through why this rustic, old-school dish deserves a place in your family dinners. Think of it as a hug on a tray – golden, caramelized, and perfect for busy weeknights or holiday meals.

What to make with carrots, onions, and potatoes easily?

Honestly, so much! This carrots recipe is a classic combination: roasted in a single layer with garlic powder, onion powder, and a little olive oil until tender. Or try a simple side dish like sheet pan roasted root vegetables with fresh herbs and melted butter for healthy comfort food.

Can you eat carrots and potatoes together?

Yes, and you should. The natural sweetness of the carrots balances the starchy comfort of the potatoes. Whether your kitchen features baby potatoes, red potatoes, or larger potatoes cut into large chunks; together they make a filling side dish that pairs with a variety of proteins or can stand alone as an easy dish for plant based days.

What cooks faster, potatoes, carrots, or onions?

Cooking times vary, but onions and red onions soften first, carrots next, and potatoes last. For even cooking, cut larger potatoes into smaller pieces and roast everything in a single layer on a sheet pan. If necessary, spread your veggies over two trays so they have plenty of room to roast instead of steam. That way you won’t be left with half-crunchy veg and a few soggy onions. 

Ingredients (Serves 4)

• 4 medium potatoes (baby potatoes, red potatoes, sweet potatoes, or russet potatoes all work), cut into small chunks
• 3 large carrots (or baby carrots for less prep), sliced into 1cm (1/2 inch) pieces
• 2 onions (red onions add extra sweetness), thinly sliced
• 3 tbsp olive oil or melted butter
• 1 tsp salt
• ½ tsp black pepper
• 1 tsp garlic powder
• 1 tsp onion powder (optional)
• 1 tsp dried thyme, rosemary, or fresh parsley for garnish
• 2 tbsp lemon juice (optional for zesty freshness)

How To Make My Potato Carrot Onion Sheet Pan Dinner

1. Preheat your oven (or air fryer for a quick, single serve weeknight meal option) to 200°C (400°F).
2. In a large bowl, toss potatoes, carrots, and onions with olive oil, garlic powder, onion powder, salt, pepper, and herbs.
3. Spread everything out in a single layer on a parchment paper lined baking sheet for even cooking.
4. Roast for about 45 minutes, stirring halfway, until golden brown and fork-tender.
5. Garnish with fresh parsley and a splash of lemon juice before serving.

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Why You’ll Love This

• Easy side dish: This potato carrot onion recipe works for busy weeknights, family dinners, or holiday meals.
• Rustic & homemade: Root vegetables caramelize beautifully in the oven.
• Much flexibility: Swap in sweet potatoes, baby carrots, or whatever’s left in the fridge.
• Healthy comfort food: Full of nutrients, wholesome, and IBD friendly (yay for those of us on a medically restrictive diet).
• Pairs with anything: From vegetarian mains to chuck roast, or other proteins.

Tips & Tricks

• Cut larger potatoes into small cubes for quicker cooking times.
• Store leftovers in an airtight container in the fridge for 3-4 days.
• Reheat in a warm oven or air fryer to bring back the crisp.
• Keep ingredient amounts flexible in this potato carrot onion recipe. This is rustic cooking at its finest.
• Add fresh herbs like parsley right before serving for a pop of freshness.

Easy Substitutions

• Dairy-free: Stick to olive oil instead of melted butter.
• IBD-friendly tweak: Use peeled carrots and potatoes, skip heavy spices.
• For a low calorie diet: Adjust ingredient amounts and use less oil.
• If cooking for a dinner party: Double or triple the recipe card ingredient amounts. Just remember to spread your veggies over several baking trays for ultimate roasting results.
• Air fryer option: Same simple steps, just reduce cooking time to 20 – 25 minutes.

This potato carrot onion recipe is one of those easy dishes that proves the simplest food can be the most comforting. It’s been a long time favorite in our household and I hope you’ll fall in love with it as well. 

Now tell me in the comment section: What’s your favorite nostalgic carrots recipe or potato dish? Is it a similar potato carrot onion sheet pan dinner? Did your grandma serve root vegetables with fresh herbs? What’s your weeknight dinner go-to? Share below, I love hearing your stories!

Roasted Potato Carrot Onion Sheet Pan Dinner

Yield: serves 4-6

Prep Time: 5 minutes

Cook Time: 45 minutes

Total Time: 50 minutes

A cozy hug on a tray.

Print

Ingredients

• 4 medium potatoes (baby potatoes, red potatoes, sweet potatoes, or russet potatoes all work), cut into small chunks
• 3 large carrots (or baby carrots for less prep), sliced into 1cm (1/2 inch) pieces
• 2 onions (red onions add extra sweetness), thinly sliced
• 3 tbsp olive oil or melted butter
• 1 tsp salt
• ½ tsp black pepper
• 1 tsp garlic powder
• 1 tsp onion powder (optional)
• 1 tsp dried thyme, rosemary, or fresh parsley for garnish
• 2 tbsp lemon juice (optional for zesty freshness)

Instructions

1. Preheat your oven (or air fryer for a quick, single serve weeknight meal option) to 200°C (400°F).
2. In a large bowl, toss potatoes, carrots, and onions with olive oil, garlic powder, onion powder, salt, pepper, and herbs.
3. Spread everything out in a single layer on a parchment paper lined baking sheet for even cooking.
4. Roast for about 45 minutes, stirring halfway, until golden brown and fork-tender.
5. Garnish with fresh parsley and a splash of lemon juice before serving.

Notes

• Cut larger potatoes into small cubes for quicker cooking times.
• Store leftovers in an airtight container in the fridge for 3-4 days.
• Reheat in a warm oven or air fryer to bring back the crisp.
• Keep ingredient amounts flexible in this potato carrot onion recipe. This is rustic cooking at its finest.
• Add fresh herbs like parsley right before serving for a pop of freshness.