01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - In a skillet over medium heat, sauté the diced onion until translucent, about 3 minutes. Add ground beef, garlic powder, salt, and black pepper. Cook until the beef is evenly browned, then drain excess fat.
03 - Stir in ketchup, yellow mustard, Worcestershire sauce, and chopped pickles. Remove skillet from heat and allow the beef mixture to cool slightly.
04 - Gently flatten each biscuit round. Spoon 1 tablespoon of the beef mixture and 1/2 tablespoon shredded cheddar into the center. Place one mozzarella cube on top of the filling.
05 - Fold dough over the fillings, pinching the edges to fully seal and form a ball. Arrange seam side down on the prepared baking sheet.
06 - Brush each dough ball with beaten egg using a pastry brush. Sprinkle the tops with sesame seeds.
07 - Bake for 15 to 18 minutes, or until the bombs are golden brown.
08 - Let bombs cool slightly before serving. Accompany with burger sauces for dipping as desired.