Serve over rice or linguine for a one-dish meal. If you don't have fresh herbs, substitute 1 tablespoon dried basil and 1 teaspoon dried oregano.
Combine breadcrumbs and 4 tablespoons Parmesan cheese, and dredge chicken in mixture.
Cook chicken in hot oil in a large skillet over medium-high heat 4 minutes on each side or until browned. Remove chicken from skillet.
Add mushrooms and bell pepper to skillet; sauté 3 minutes. Add tomato, garlic, and salt; return chicken to skillet. Cover, reduce heat, and simmer 10 minutes. Stir in basil, oregano, and remaining 2 tablespoons Parmesan cheese. Serve immediately.