This French Onion Chicken Bake transforms the deeply comforting, sweet, and savory elements of a classic French onion soup into a spectacular, high-protein weeknight dinner. By smothering tender chicken breasts in rich, balsamic-caramelized onions and topping them with a bubbly blanket of gooey mozzarella and sharp Parmesan, you get a restaurant-quality meal right at home.
Ingredients:
| Ingredient |
Quantity |
| Butter |
4 / tablespoons |
| Balsamic vinegar |
2 / tablespoons |
| Low-sodium beef broth |
2/3 / cup |
| Onions (peeled and sliced) |
4 / pieces |
| Mozzarella cheese (shredded) |
1 / cup |
| Boneless, skinless chicken breasts |
4 / pieces |
| Parmesan cheese (shredded) |
1/2 / cup |
| Black pepper |
1/2 / teaspoon |
| Salt |
1/2 / teaspoon (plus extra to taste) |
| Garlic (minced) |
4 / cloves |
| Fresh or dry thyme |
1 / teaspoon |
Step-by-Step Directions:
Phase 1: Caramelizing the Onions
1.Oven and Pan Setup: 5 min.
Preheat your oven to 200°C (400°F). Lightly coat a standard baking dish with nonstick cooking spray and set it aside. Place a large skillet on the stovetop over medium-high heat and melt the 4 tablespoons of butter.
2.Soften the Onions: 5 min.
Add your 4 sliced onions to the melted butter. Sauté them for a few minutes, stirring occasionally, until they lose their stiffness, turn translucent, and begin to soften.
3.Build the Savory Base: 10 min.
Turn the burner heat down to medium-low. Stir in the 4 minced cloves of garlic, 1/2 teaspoon of black pepper, and 1 teaspoon of thyme. Sauté for about 1 minute until fragrant. Pour in the 2 tablespoons of balsamic vinegar and 2/3 cup of low-sodium beef broth, using a wooden spoon to vigorously scrape up all the delicious browned bits stuck to the bottom of the pan. Simmer gently until the liquids reduce and the onions turn deeply rich and caramelized.
Phase 2: Layering & Baking
1.Assemble the Casserole: 5 min.
Spread roughly 1/3 of your caramelized onion mixture evenly across the bottom of the prepared baking dish. Arrange the 4 boneless, skinless chicken breasts in a single layer directly over the onions. Season the chicken generously with your salt to taste.
2.Top with Onions & Cheese: 2 min.
Spoon the remaining 2/3 of the caramelized onions directly over the top of the chicken breasts. Blanket the onion layer completely with a generous mix of the 1 cup of shredded mozzarella and 1/2 cup of shredded Parmesan cheese.
3.Bake to Perfection: 30 min.
Place the baking dish into the preheated oven. Bake for approximately 30 minutes, or until the chicken is completely cooked through (registering an internal temperature of 165°F / 74°C) and the cheese layer on top is melted, golden brown, and bubbling.
4.Rest and Serve: 5 min.
Remove the dish from the oven and let it rest at room temperature for a few minutes. This allows the savory juices to redistribute back into the chicken fibers, keeping it incredibly juicy. Serve warm and enjoy!
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