01 -
Pat chicken breasts dry and evenly season both sides with garlic powder, paprika, salt, and black pepper. Heat olive oil in a large skillet over medium-high heat and sear chicken for 4 to 5 minutes per side until golden brown. Transfer chicken to a plate, keeping it partially cooked.
02 -
In the same skillet, melt unsalted butter over medium heat. Add sliced onions and mushrooms, stirring occasionally for 8 to 10 minutes until onions are glossy and starting to caramelize and mushrooms have softened.
03 -
Sprinkle flour over the onions and mushrooms, mixing thoroughly to coat. Cook for 1 minute to eliminate the raw flour taste. Gradually pour in chicken broth, whisking constantly to avoid lumps. Let the mixture simmer for 2 to 3 minutes until a smooth, thickened gravy develops.
04 -
Preheat oven to 375°F. Arrange seared chicken breasts in a baking dish. Evenly distribute onion and mushroom gravy over each piece. Lay a slice of cheese atop each portion. Cover with foil and bake for 20 to 25 minutes, or until chicken is cooked through and cheese is melted and bubbling.
05 -
Allow the dish to rest for 3 minutes after removing from oven. Serve hot, optionally garnished with fresh herbs.