Dinner · American

French Onion Chicken with Roasted Carrots and Mashed Potatoes

Daniel Brooks

Recipe by Daniel Brooks

Grilling & hearty mains · June 28, 2026

This is comfort food that eats like a restaurant dinner but comes together on a weeknight. Juicy chicken gets crowned with jammy caramelized onions and melty mozzarella, then served alongside buttery mashed potatoes and sweet roasted carrots. It hits every craving on one plate.

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French Onion Chicken with Roasted Carrots and Mashed Potatoes

Why you'll love this

  • Steakhouse flavor with grocery store basics
  • Everything finishes in about 45 minutes
  • One satisfying plate with protein, veg, and a starch
  • Caramelized onion and melty cheese on every bite

EveryDayMeal recipe

French Onion Chicken with Roasted Carrots and Mashed Potatoes

Prep
15m
Cook
30m
Total
45m
Serves
2
Level
Easy

Ingredients

  • 2 chicken breasts
  • 12 ounces carrots
  • 5 potatoes
  • 1 onion
  • 1 beef stock concentrate
  • 1 1/2 cups shredded mozzarella
  • 2 tbsp sour cream
  • 2 tbsp butter
  • 1 tsp sugar
  • as needed vegetable oil
  • to taste salt
  • to taste pepper

Equipment

  • Baking sheet
  • Medium pot
  • Large skillet with lid
  • Potato masher
  • Cutting board and knife

Instructions

  1. Preheat your oven to 425 degrees and wash and dry all the produce. Trim and peel the carrots, then slice them on a diagonal into quarter inch pieces so they roast evenly. Dice the potatoes into half inch chunks for quick, even cooking, and halve and thinly slice the onion.
  2. Spread the carrots on a baking sheet and toss with a drizzle of oil, salt, and pepper. Roast for 15 to 20 minutes until they are browned at the edges and tender when pierced, which brings out their natural sweetness.
  3. While the carrots roast, put the potatoes in a medium pot and cover with salted water by about two inches. Bring to a boil and cook for 12 to 15 minutes until a fork slides in easily, then drain and return them to the pot and cover to keep warm.
  4. Meanwhile, heat a drizzle of oil in a large pan over medium high heat. Add the onion and cook, stirring now and then, for 8 to 10 minutes until soft and golden so it turns sweet instead of sharp. Sprinkle with the sugar, then stir in the stock concentrate and 2 tablespoons water and season with salt and pepper. Cook 2 to 3 minutes more until jammy, then transfer to a bowl and wipe out the pan.
  5. Pat the chicken dry with paper towels and season all over with salt and pepper, which helps it brown well. Heat a drizzle of oil in the same pan over medium high heat, add the chicken, and cook 5 to 6 minutes per side until golden and cooked through (165 degrees inside). In the last minute or two, pile the caramelized onions and mozzarella on top, then cover the pan until the cheese melts.
  6. Set the pot of drained potatoes over low heat and mash with the sour cream, butter, salt, pepper, and a splash of water or milk until smooth and creamy. Divide the chicken, carrots, and mashed potatoes between plates and serve right away.

Tips from the kitchen

  • Use a meat thermometer to check the chicken hits 165 degrees so it stays juicy and never dries out.
  • If your pan has no lid, cover it with a baking sheet to trap the heat and melt the cheese fast.
  • Pound thicker chicken breasts to an even thickness so they cook through at the same rate.

Estimated nutrition per serving: 720 cal · 52g protein · 58g carbs · 30g fat

Make it your own

  • Swap mozzarella for Gruyere or provolone for a sharper, more classic French onion flavor.
  • Use boneless chicken thighs instead of breasts for an even juicier, more forgiving result.
  • Stir roasted garlic into the mashed potatoes for an extra layer of flavor.

Storing & make-ahead

Store components separately in airtight containers in the fridge for up to 3 days. Reheat the chicken gently in a covered pan or microwave, and loosen the mashed potatoes with a splash of milk while warming.

Good to know

Can I make this ahead?
Yes. Caramelize the onions and boil the potatoes a day ahead, then sear the chicken and finish the mash just before serving for the freshest results.
What can I use instead of beef stock concentrate?
Use about half a cup of strong beef broth and let the onions simmer a little longer to reduce it into a jammy glaze.
How do I keep the chicken from drying out?
Cook just until it reaches 165 degrees inside, then let it rest a couple of minutes. An even thickness also helps it cook uniformly.
Can I double this for four?
Absolutely. Double all ingredients, use two pans or work in batches for the chicken so it browns instead of steaming.

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