01 -
Evenly coat the chicken breasts with garlic powder, paprika, salt, and black pepper.
02 -
Heat olive oil in a large skillet over medium-high heat. Cook chicken breasts for 4 to 5 minutes per side until golden brown, without fully cooking through.
03 -
Melt butter in the same skillet. Add sliced onions and mushrooms and sauté over medium heat, stirring occasionally, until soft and caramelized, about 8 to 10 minutes.
04 -
Sprinkle flour over the caramelized onions and mushrooms. Stir to coat evenly and cook for 1 minute. Gradually add chicken broth, whisking constantly, and simmer until a smooth, thickened gravy forms.
05 -
Preheat oven to 375°F (190°C). Arrange the seared chicken breasts in a baking dish. Cover each piece with the onion-mushroom mixture and a slice of cheese. Pour the prepared gravy over all. Cover tightly with foil and bake for 20 to 25 minutes, until the chicken reaches an internal temperature of 165°F (74°C) and the cheese is fully melted.