Caramelized Onion and Gruyère Stuffed Chicken Breast

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Tender chicken breasts stuffed with sweet onions and melted Gruyère cheese, baked with a savory herb crust. This french-inspired chicken ready in about 50 minutes pairs (6 oz each) chicken breasts, thinly sliced yellow onion, butter for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 420 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 25 min Cook: 25 min Serves 4 French cuisine 420 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F (190°C). Cut a horizontal pocket into each chicken breast without cutting through the bottom. Season inside with 1/4 tsp salt and 1/8 tsp black pepper.
  2. Step 2: Melt 3 tbsp butter in a skillet over medium heat. Add 2 cups thinly sliced yellow onion and cook for 15 minutes, stirring occasionally, until deeply golden and caramelized.
  3. Step 3: Stir 1 cup shredded Gruyère cheese into the caramelized onions until melted. Remove from heat and mix in 1 tbsp dijon mustard and 1 tbsp chopped thyme.
  4. Step 4: Divide onion mixture evenly among chicken breasts, pressing gently to fill. Secure with toothpicks if needed.
  5. Step 5: Heat 2 tbsp olive oil in an oven-safe skillet over medium-high heat. Add chicken and sear for 2 minutes per side until golden. Transfer skillet to oven and bake for 20 minutes until chicken reaches 165°F.
  6. Step 6: Let rest 5 minutes before serving, discarding toothpicks. Serve with pan juices.

Frequently asked questions

How long does Caramelized Onion and Gruyère Stuffed Chicken Breast take to make?

Total time is about 50 minutes (25 min prep + 25 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Caramelized Onion and Gruyère Stuffed Chicken Breast?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep (6 oz each) chicken breasts from drying out.

Can I substitute ingredients in Caramelized Onion and Gruyère Stuffed Chicken Breast?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Caramelized Onion and Gruyère Stuffed Chicken Breast for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Caramelized Onion and Gruyère Stuffed Chicken Breast?

French chicken like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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