These Italian square meatballs take just ten minutes to prepare and are the perfect make-ahead solution for quick weeknight dinners. Here’s how it’s done! Step 1: Line pan with foil and spray foil with cooking spray. In a large bowl, beat egg and stir in all remaining ingredients. Step 2: In the foil-lined pan, shape the beef mixture into an 8-inch square. Cut into 25 squares; do not separate. Step 3: Bake 20-25 minutes. Step 4: Cut apart meatballs with sharp knife. Step 5: Let meatballs cool, then put into freezer-safe containers or bags. Label and store for up to two months.