Meatball Sandwiches

1 batch meatballs (30) -- frozen or thawed
1 cup ketchup
3/4 cup brown sugar -- packed
1/4 cup onion (up to 1/2) -- chopped
1/4 teaspoon garlic powder
1/8 teaspoon liquid smoke, optional
6 sandwich rolls -- split

Place meatballs in an ungreased 1-qt baking dish. Combine the next five ingredients; pour over meatballs.

Cover and bake at 350� F. for 1 hr. Serve on rolls.

Note: Use Make Ahead Meatballs or buy frozen ones.