Dredge chicken in mixture of breadcrumbs and 4 Tbsp parmesan cheese.
Heat oil in a large skillet over medium-high heat. Cook chicken 4 minutes on each side or until browned. Remove chicken from skillet and set aside.
Add mushrooms and bell pepper to skillet; saute' 3 minutes. Add tomatoes, garlic, and salt; return chicken to skillet. Cover, reduce heat, and simmer 10 minutes or until chicken is done. Stir in basil, oregano, and remaining 2 Tbsp parmesan cheese.