1. In a large bowl combine the ground beef, egg, crumbs, milk, 1/2 cup BBQ sauce, onion, salt, pepper and garlic powder. 2. Mix together with your hands until thoroughly combined. 3. Cut the top and bottom off onion, cut in half and peel off skin. Then separate the onion into "layers." Use the larger outside layers. 4. Stuff your meatball mix between two onion layers (essentially making an onion seal around a large meatball. 5. Wrap each "bomb" with 3 slices of bacon and secure with toothpicks. 6. Bake in a dish with sides (to catch grease) at 425 for approximately 40 minutes or until internal temp reaches 165 degrees. 7. Serve with the additional BBQ sauce for dipping.