Preheat oven to 375°. In a large bowl, combine the first 9 ingredients. Add beef and turkey; mix lightly but thoroughly. Place 1/3 cup mixture into each of 12 ungreased muffin cups, pressing lightly., In a small bowl, mix topping ingredients; spoon over meat loaves. Bake, uncovered until a thermometer reads 165°, 15-20 minutes. Freeze option: Bake meat loaves without topping. Cool meat loaves, and freeze, covered, on a waxed paper-lined baking sheet until firm. Transfer meat loaves to an airtight container; return to freezer. To use, partially thaw in refrigerator overnight. Place meat loaves on a greased shallow baking pan. Prepare topping as directed; spread over tops. Bake in a preheated 350° oven until heated through.