1.) Place flour in a paper bag; shake chicken pieces in flour to coat. In a large frying pan, heat oil. Add chicken and cook, turning, until browned, about 10 minutes. Remove to a 13x9x2 baking dish.
2.) While chicken is browning, mix tomato sauce, wine, oregano, salt, and pepper in a small bowl.
3.) Add garlic to pan drippings and saut� 1 minute. Add bell peppers and mushrooms; cook 5 minutes. Stir in tomato sauce mixture. Pour over chicken.
5.) Cover with foil and bake at 180ºC or 45 minutes, until chicken is tender. Sprinkle with parmesan cheese.