01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Heat a skillet over medium heat. Sauté diced onion for 3 minutes or until translucent. Add ground beef, garlic powder, salt, and black pepper. Cook until the beef is browned, breaking it into crumbles. Drain any excess fat.
03 - Stir in ketchup, yellow mustard, Worcestershire sauce, and chopped pickles. Remove from heat and allow the mixture to cool slightly.
04 - Flatten each biscuit dough round. Place 1 tablespoon of the beef mixture and 1/2 tablespoon shredded cheddar cheese in the center. Add a mozzarella cube on top.
05 - Wrap the dough around the filling and pinch the edges to seal completely, forming a sealed ball. Arrange seam side down on the prepared baking sheet.
06 - Brush each dough ball with the beaten egg. Sprinkle sesame seeds on top.
07 - Bake for 15 to 18 minutes or until the dough is golden brown and cooked through.
08 - Allow to cool slightly before serving. Serve with additional dipping sauces if desired.