01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a skillet over medium heat, sauté onion until translucent, about 3 minutes. Add ground beef, garlic powder, salt, and pepper. Cook until beef is browned, then drain any excess fat.
03 - Stir in ketchup, mustard, Worcestershire sauce, and chopped pickles. Remove skillet from heat and let mixture cool slightly.
04 - Flatten each biscuit round. Place 1 tablespoon of the cooled beef mixture and 1/2 tablespoon shredded cheddar in the center. Top with a mozzarella cube.
05 - Wrap dough around the filling, pinching edges to seal completely and shape into a ball. Position each seam side down on the prepared baking sheet.
06 - Brush each dough ball with beaten egg and sprinkle evenly with sesame seeds.
07 - Bake for 15 to 18 minutes or until the biscuit exterior is deep golden brown.
08 - Allow bombs to cool for several minutes before serving. Pair with extra burger sauces or condiments for dipping.