1. Heat oven to 400°F. Combine ground beef, bread crumbs, egg whites, water, salt and pepper in large bowl, mixing lightly but thoroughly. Shape into thirty-six 1-1/4-in. meatballs. Place on rack in broiler pan that has been sprayed with cooking spray. Bake in 400°F oven 15-17 min.
2. Meanwhile, heat preserves, barbecue sauce and mustard in medium saucepan over medium heat. Bring to a boil; reduce heat; simmer, uncovered, 3-5 min., stirring occasionally or until sauce thickens slightly.
3. Add cooked meatballs and continue to cook 2-3 min. or until meatballs are heated through, stirring occasionally. Serve or keep warm in slow cooker (see tip below).
* To keep meatballs warm, place in a 2-1/2 qt. slow cooker set on Low. Keep covered to maintain heat. Meatballs can be held up to 2-1/2 hrs., stirring occasionally.