Make a pocket in the chicken breasts the lightly salt and pepper. Saute mushrooms, onion, and red pepper in olive oil for 5 minutes. Mix this into a bowl with ricotta cheese and garlic powder. Mix well. Spoon mixture into chicken breasts. Try to have some remaining stuffing to place on top 5 minutes before chicken is done. I usually set it to high broil for the last 5 minutes to get a nice brown color.