Preheat oven to 450°. Coat baking dish with cooking spray. Pound chicken to uniform thickness. Dip chicken into egg, then cover with bread crumbs. Place in a single layer in dish. Bake 15 to 20 minutes, or until golden and crisp. Don't turn. Remove from oven; top with sauce and cheese. Return chicken to oven for 5 to 10 minutes or until cheese melts. You can place under broiler for 30 seconds for added browning.
Variations on the sauce and cheese- Fiesta Chicken: Use salsa as the sauce and top with shredded Mexican blend cheese mix. Mediterranean Chicken: Use canned oregano and garlic flavored diced tomatoes instead of sauce and top with crumbled feta cheese. BBQ Chicken: Use BBQ sauce and top with shredded cheddar cheese. Florentine Chicken: Saute 10-oz bag of baby spinach in olive oil until wilted. Squeeze liquid from spinach and spread on chicken. Sprinkle with shredded Swiss cheese.