Baked Chicken with Mushrooms and Cheese

3. **Cook the Mushrooms:**
– In the same skillet, add the butter. Once melted, add the sliced mushrooms and onions. Cook until the mushrooms are browned and the onions are soft, about 5-7 minutes.
– Add the minced garlic and cook for another minute until fragrant.
– (Optional) Pour in the chicken broth or white wine to deglaze the pan, scraping up any browned bits from the bottom. Let it simmer until the liquid reduces by half.
– Season with salt and pepper to taste.

4. **Assemble the Dish:**
– Spoon the mushroom and onion mixture over each chicken breast.
– Generously sprinkle the grated cheese over the top of the mushrooms.