01 -
Pat chicken breasts dry with paper towels. Season both sides with garlic powder, paprika, salt, and black pepper. Heat olive oil in a large skillet over medium-high heat. Place chicken breasts in the skillet and sear each side for 4 to 5 minutes until golden brown. Remove chicken from skillet and set aside.
02 -
Lower heat to medium. Add butter to the same skillet and melt. Add sliced onions and mushrooms; sauté for 8 to 10 minutes, stirring occasionally, until onions are glossy and golden and mushrooms have released their moisture and begun to caramelize.
03 -
Sprinkle flour evenly over sautéed onions and mushrooms, stirring to coat. Cook for 1 minute, stirring constantly, to remove raw flour taste. Gradually pour in chicken broth, whisking continuously to prevent lumps. Simmer for 2 to 3 minutes until the gravy thickens to a velvety consistency.
04 -
Preheat oven to 375°F. Arrange seared chicken breasts in a baking dish. Top each breast with the onion and mushroom mixture. Place a slice of cheese over each portion. Pour gravy evenly over the chicken, cover baking dish tightly with foil, and bake for 20 to 25 minutes until chicken is cooked through and cheese is melted and bubbling.
05 -
Remove from oven and let rest for 3 to 5 minutes to allow flavors to meld. Serve hot, topped with additional gravy if desired.