01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a skillet over medium heat, cook diced onion until translucent, about 3 minutes. Add ground beef with garlic powder, salt, and pepper. Sauté until beef is browned, then drain excess fat.
03 - Mix in ketchup, mustard, Worcestershire sauce, and chopped pickles. Remove skillet from heat and allow the mixture to cool slightly.
04 - Flatten each biscuit into a round disc. Spoon about 1 tablespoon beef mixture and 1/2 tablespoon shredded cheddar onto the center of each round. Place a mozzarella cube on top.
05 - Fold dough over filling and pinch edges tightly to seal, forming a ball. Position seam side down on the prepared baking sheet.
06 - Brush each assembled bomb with beaten egg, then sprinkle with sesame seeds.
07 - Place baking sheet in the oven and bake for 15 to 18 minutes, or until the dough is golden brown.
08 - Let bombs cool slightly before serving. Pair with additional burger sauces for dipping if desired.