01 - Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
02 - Heat 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 the beef is browned throughout, then drain excess fat.
03 - Stir ketchup, yellow mustard, Worcestershire sauce, and chopped pickles into the cooked beef mixture. Remove from heat and let cool slightly.
04 - Flatten each biscuit with your hands. Place about 1 tablespoon of the beef filling and 1/2 tablespoon shredded cheddar in the center of each round. Set a cube of mozzarella on top.
05 - Fold the dough around the filling, pinching the edges firmly to enclose and form a ball. Arrange seam side down on the prepared baking sheet.
06 - Brush each bomb with beaten egg using a pastry brush and sprinkle evenly with sesame seeds.
07 - Bake for 15 to 18 minutes or until biscuit bombs are golden and cooked through.
08 - Remove from oven and allow to cool slightly. Serve warm with your preferred burger sauces on the side.