Prepare onion. Chop onion into small pieces.Mince garlic cloves.Prepare dipping station with 2 bowls, add milk to the first and grated topping to the second.Dip chicken in milk then in grated topping, turning to evenly coat both sides of each breast.Heat oil in large nonstick skillet on medium heat. Add onions and garlic; cook and stir 3 min. Add chicken; cook 3 min. on each side. Add tomato sauce and pepper; cover. Simmer 15 min. or until chicken is done (165ºF).Meanwhile, cook pasta in large saucepan as directed on package, adding broccoli to boiling water for the last 2 min.Sprinkle shredded cheese over chicken; cook 2 to 3 minutes or until mozzarella is melted. Top with fresh herbs and grated cheese.Drain pasta mixture. Serve with chicken.