1 egg, beaten
1 ounce vegatable oil
2 ounces dry bread crumbs 
2 skinless, boneless chicken breast halves 
1 jar spaghetti sauce 
2 ounces shredded mozzarella cheese 
1/4 cup grated Parmesan cheese 

Preheat oven to 350 degrees F (175 degrees C).  
Pour egg into a small shallow bowl, mix in vegatable oil. Place bread crumbs in a separate shallow bowl. Dip chicken into egg/oil mixture, then into the bread crumbs. Place coated chicken on a prepared baking sheet and bake in the preheated oven for 40 minutes, or until no longer pink and juices run clear. 
Pour 1/2 of the spaghetti sauce into a seperate baking dish. Place chicken over sauce, and cover with remaining sauce. Sprinkle mozzarella and Parmesan cheeses on top and return to the preheated oven for 20 minutes.