My favorite recipe for make-ahead meatballs is from Pioneer Woman. But I like to tweak it a little for convenience. Here's my adaptation:
3 pounds Ground Beef
3 cloves Garlic, Minced
1.5 cups Bread Crumbs
4 whole Eggs
1.5 cups Grated Parmesan
1/2 teaspoon Salt
Freshly Ground Black Pepper
Splash Of Milk
Preheat over to 400F Degrees. Combine meat, garlic, breadcrumbs, Parmesan, eggs, salt, pepper, and a splash of milk in a mixing bowl. Mix together well with hands. Spray cookie sheet with oil. Roll into 25 1 1/2-inch balls and place on a cookie sheet. Bake uncovered for 20 minutes or until no longer pink in the center. Cooking time varies based on how big you made your meatballs.
Once the meatballs have cooled, I separate them into gallon freezer bags with about 15 meatballs per bag. That's usually enough for a meal for my family of 4. Since these are pre-cooked, all you have to do is throw them on the stove in the spaghetti sauce while you cook your noodles to heat them through.

