1 cup spaghetti sauce
1/2 cup water
2 Tbsp. KRAFT 100% Grated Parmesan Cheese
12 oz. (3/4 of 1-lb. pkg.) frozen cooked meatballs
4 crusty sandwich buns, split
3/4 cup KRAFT Shredded Mozzarella Cheese
COOMBINE spaghetti sauce, water, Parmesan cheese and meatballs in large skillet. Bring to boil on medium-high heat.
REDUCE heat to medium; simmer 8 min. or until meatballs are heated through, stirring occasionally.
SPOON into buns; sprinkle with mozzarella cheese.
these are YUMMY!