Preheat the oven to 375 degrees F. Season the chicken breasts with garlic powder, Italian seasonings, salt, and pepper.
Heat a large skillet with oil on a medium flame, add the chicken breasts and cook for 7-8 minutes until they turn golden. Transfer them to a plate and set aside.
To the same skillet add the butter. Once the butter is melted add in the yellow onion, garlic, and mushrooms. Cook for 5-7 minutes until the mushrooms start releasing moisture.
Add half of the sauteed mushroom mixture to a baking dish and spread evenly. Place the chicken breasts over the mushroom mixture.
To the remaining half of the mushroom mixture, add the chicken broth and allow to simmer for 2 minutes.
Top the chicken breasts with the remaining mushroom mixture and pour the liquid on top. Add mozzarella cheese over the chicken breasts and bake for 15-20 minutes until the chicken is cooked through.
Remove from the oven, garnish with chopped fresh parsley, and serve.
Notes
Store any leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently to avoid drying out the chicken.