Preheat oven to 425°. In a bowl, combine the first three ingredients; set aside. Whip the egg gently with a fork in a separate bowl; set aside. Cut each string cheese stick into 4 pieces. Coat each cheese piece in egg, then toss in bread crumbs to coat. Repeat this twice so all pieces are double-breaded. Place cheese on a greased, foil-lined baking sheet. Bake for about 7 minutes. Serve with prepared Mama Mia Marinara sauce mix or your favorite dipping sauce.