Preheat oven to 325°.
Mix ground meats, bread crumbs, eggs, and 1/2 cup of the milk (by hand is easiest) until well combined. If the mixture is too dry, add the remaining milk, 1/4 cup at a time, until desired consistency is reached. Form into 1 1/2" meatballs (see note below).
Place in three 9"x 13" metal pans or two large, rimmed, baking sheets (12"x16"x1") that have been coated with cooking spray. Do not overcrowd.
Combine all sauce ingredients.
Pour half of sauce over meatballs.
Bake meatballs, uncovered, for 20 minutes.
Turn meatballs. Pour remaining sauce over the top. Return to oven and bake for an additional 10-15 minutes, or until centers of meatballs are thoroughly cooked.
Remove from oven and serve.