Meatball Sub Bubble Up Bake is a delicious and easy-to-make casserole that combines the flavors of a meatball sub sandwich with a cheesy bubble up bake. It features meatballs, marinara sauce, mozzarella cheese, and refrigerated biscuit dough. The dish is baked until the biscuits are golden brown and the cheese is melted and bubbly. It is a comforting and satisfying meal that the whole family will enjoy.