Mac & Cheese Stuffed Meatballs!

Bahan-bahan (10 porsi)

• 1 ½ pounds lean ground beef
• 2 tablespoons finely chopped onion
• 1 egg
• ⅓ cup Panko bread crumbs
• ½ cup shredded cheddar cheese
• ½ teaspoon black pepper
• 1 ½ ounces cheddar cheese (cut into 10 small cubes)
• 1 cup prepared macaroni and cheese (chilled, I used this Quick Stove Top Mac & Cheese Recipe)
• 2 tablespoons barbecue sauce (optional)