01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - In a skillet over medium heat, cook onion until translucent, about 3 minutes. Add ground beef, garlic powder, salt, and black pepper. Cook, stirring frequently, until beef is browned. Drain excess fat.
03 - Stir in ketchup, yellow mustard, Worcestershire sauce, and chopped pickles. Remove skillet from heat and allow mixture to cool slightly.
04 - Flatten each biscuit round. Spoon about 1 tablespoon beef mixture and 1/2 tablespoon shredded cheddar into the center. Place one mozzarella cube on top.
05 - Fold the dough over the filling, pinching edges to fully seal and form a ball. Place each filled ball seam side down on the prepared baking sheet.
06 - Brush the tops with beaten egg and sprinkle with sesame seeds.
07 - Bake in preheated oven for 15 to 18 minutes, or until biscuit bombs are golden brown.
08 - Allow to cool slightly before serving. Enjoy with extra burger sauces for dipping if desired.