French Onion Chicken Bake

Step 3: Season and Sear the Chicken

Pat the chicken breasts dry. Season both sides with salt and black pepper.
In another skillet (or use the same one after removing onions), add a touch more olive oil and sear the chicken breasts over medium-high heat for 2-3 minutes per side until golden brown (they don’t need to be cooked through yet).

Step 4: Assemble the Bake

Place seared chicken breasts into the greased baking dish.
Spoon the caramelized onion mixture evenly over the chicken.
Sprinkle Gruyère cheese over the onions, then top with Parmesan.

Step 5: Bake

Bake uncovered in the preheated oven for 25–30 minutes, or until the chicken is cooked through (internal temp of 165°F or 74°C) and the cheese is bubbling and golden.

Step 6: Garnish and Serve

Let rest for 5 minutes after baking. Sprinkle chopped fresh parsley over the top and serve warm. It pairs beautifully with mashed potatoes, rice, or crusty bread.

Tips for Success

Use a mix of cheeses for added flavor complexity.
For extra richness, add a splash of cream to the onion mixture before assembling.
Bone-in thighs can be used instead of breasts for juicier meat—just adjust the cooking time accordingly.

This French Onion Chicken Bake is a hearty, flavor-packed dish that transforms humble ingredients into an indulgent meal. It brings all the comfort of French onion soup in a heartier, protein-rich form—perfect for a weeknight dinner or a special occasion.