So this is why I always bake my meatballs elevated on a baking rack and never directly on the baking sheet. When you bake the meatballs, the fats are going to bake out and pool underneath the meatball. If your meatball isn't elevated, it means it's sitting in these fats and staying a little too wet. Raise them up on the baking rack and you'll still get all the flavors of a deliciously moist meatball without the soggy fat.