Step 1:Begin by flattening each chicken breast half to a uniform thickness of 1⁄4 inch. Thisensures even cooking and a tender texture. Next, prepare a shallow bowl filled withflour.Take each piece of chicken and gently dip it into the flour, making sure to coatboth sides thoroughly. Once the chicken is evenly covered with flour, give it a gentleshake to remove any excess. This step not only adds a light, crisp exterior but alsohelps the chicken cook evenly and retain its moisture.
Step 2:Heat a large skillet over medium heat and melt 2 tablespoons of butter. Once thebutter is hot and bubbling, carefully place the floured chicken breasts in the skillet.Cook the chicken until it is nicely browned on both sides, ensuring a golden, crispyexterior. This should take about 3-4 minutes per side. Once browned, transfer thechicken breasts to a greased 11x7- inch baking dish, arranging them in a single layer
Step 3:In the same skillet, add the remaining 1 tablespoon of butter. Allow the butter to melt,then add the sliced mushrooms. Saute the mushrooms until they are tender and havereleased their juices, stirring occasionally to ensure even cooking. This should take about4-5 minutes. Next, pour in the chicken broth, and season with salt and pepper to taste.Increase the heat to bring the mixture toa boil. Allow it to cook, stirring occasionally, until theliquid has reduced to about ½ cup, which should take around 5 minutes. Once reduced,spoon the flavorful mushroom mixture over the browned chicken breasts in the baking dish,ensuring each piece is well-coated.
Step 4:Place the baking dish, uncovered, in a preheated oven set to 375°F. Allow thechicken to bake until it is fully cooked and no longer pink in the center, which should takeapproximately 15 minutes. Once the chicken is cooked through, remove the baking dish fromthe oven and sprinkle a generous amount of shredded cheeses over the top of the chickenbreasts. Add a handful of chopped green onion for a burst of fresh flavor and color. Returnthe dish to the oven and continue baking for an additional 5 minutes, or until the cheese iscompletely melted and bubbly. This final step ensures a deliciously gooey and savorytopping that perfectly complements the tender chicken and mushrooms.