In a large bowl, beat eggs. Add oats, milk, onion, salt, pepper and garlic powder. Add the ground beef; mix well. Shape into 1 1/2 inch balls. Place in two 13-by-9-by-2-inch baking pans. Bake, uncovered, at 375 degrees for 30 minutes.
Drain; place all of the meatballs in one of the pans. In a saucepan, bring the sauce ingredients to a boil. Pour over meatballs. Bake, uncovered, 20 minutes longer or until meat is not longer pink.
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