01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - In a skillet over medium heat, cook diced onion until translucent, about 3 minutes. Add ground beef, garlic powder, salt, and black pepper. Cook, stirring, until beef is browned. Drain excess fat.
03 - Stir in ketchup, yellow mustard, Worcestershire sauce, and chopped pickles. Remove from heat and let the beef mixture cool slightly.
04 - Flatten each biscuit round. Spoon 1 tablespoon of beef mixture and 1/2 tablespoon shredded cheddar cheese onto the center of each round. Place 1 mozzarella cube in the middle.
05 - Wrap dough around the fillings, pinching edges tightly to seal and create a smooth ball. Place seam side down onto the prepared baking sheet.
06 - Brush the tops with beaten egg and sprinkle with sesame seeds.
07 - Bake for 15 to 18 minutes or until the dough is golden brown.
08 - Allow to cool slightly before serving. Enjoy with dipping sauces such as ketchup or mustard.