01 - Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
02 - In a skillet over medium heat, sauté the diced onion until translucent, about 3 minutes. Add the ground beef, garlic powder, salt, and black pepper. Cook until fully browned, then drain off any excess fat.
03 - Mix ketchup, yellow mustard, Worcestershire sauce, and chopped pickles into the cooked beef. Remove from heat and allow the mixture to cool slightly.
04 - Flatten each refrigerated biscuit dough round. Place 1 tablespoon of the cooled beef mixture and 1/2 tablespoon shredded cheddar into the center, then top with a mozzarella cube.
05 - Wrap the dough around the fillings, pinching edges to seal completely and shape into a ball. Set each ball seam-side down on the prepared baking sheet.
06 - Brush each ball with beaten egg and sprinkle with sesame seeds for a golden, textured finish.
07 - Bake in the preheated oven for 15 to 18 minutes, until the exterior is golden brown and the dough is fully cooked.
08 - Allow the bombs to cool slightly before serving. Enjoy with additional burger sauces if desired.