- Heat oven to 350°F. In small bowl, beat egg and water. In shallow dish, mix bread crumbs and Parmesan cheese. Dip chicken into egg mixture, then coat with bread crumb mixture.
- In 12-inch skillet, heat oil over medium heat. Cook half of the chicken in oil about 5 minutes, turning once, until light brown; drain. Repeat with remaining chicken, adding 1 or 2 tablespoons oil if necessary.
- In ungreased 11x7-inch (2-quart) glass baking dish, place half of the chicken, overlapping slices slightly. Spoon 1 cup of the tomato sauce over chicken. Sprinkle with 1 cup of the mozzarella cheese. Repeat with remaining chicken, sauce and cheese.
- Bake uncovered about 25 minutes or until sauce is bubbly and cheese is light brown.
Place each chicken breast between sheets of plastic wrap or waxed paper. Pound with flat side of meat mallet until 1/4 inch thick. In Step 3, cook chicken until no longer pink in center.