1- pre heat oven to 400 degrees. Coat a 15 X 10 X 1inch baking sheet with cooking spray.
2- Mix ground beef , pork,(or turkey) bread crumbs ,egg, 1 tablespoon soy sauce and mustard in a large mixing bowl. shape into 1 inch meat balls using a small ice-cream scoop.
3- place meatballs on prepared baking sheet.
4- Bake meatballs until browned and cooked through, about 10 mins.
5 combine remaining soy sauce, grape jelly,and chili sauce in 2 quart baking dish.
6 add cooked meat balls to sauce in baking dish and gently mix to coat with sauce. Cover and bake until heated through 10 mins..