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 for about 3 minutes until translucent. Add the ground beef, garlic powder, salt, and black pepper. Cook until browned, then drain any excess fat.
03 - Mix in the ketchup, yellow mustard, Worcestershire sauce, and chopped pickles. Remove from heat and allow the beef mixture to cool slightly.
04 - Flatten each biscuit round. Place 1 tablespoon of the beef filling and 1/2 tablespoon shredded cheddar cheese in the center, then top with a mozzarella cube.
05 - Fold the dough around the filling, pinching to seal and form a ball. Position seam side down on the prepared baking sheet.
06 - Brush each assembled bomb with beaten egg and sprinkle with sesame seeds.
07 - Bake for 15 to 18 minutes until golden brown and baked through.
08 - Allow to rest a few minutes before serving. Enjoy with your choice of dipping sauces.