Heat oven to 350 degrees. Mix meat, rice, 1/2 cup water, the onion, salts, garlic powder and pepper. Shape mixture by rounded tablespoonfuls into balls. Place meatballs in ungreased bakingdish, 8 x 8 x 2 inches.
Stir together remaining ingredients; pour over meatballs. Cover with aluminum foil and bake for 45 minutes, uncover; bake for an additional 15 minutes. Can be done on top of oven in a skillet, just add a little more water. Makes 4-6 servings.