01 - Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.
02 - Heat a skillet over medium. Sauté the onion until translucent, about 3 minutes. Add the ground beef, garlic powder, salt, and black pepper; cook until browned. Drain excess fat.
03 - Stir ketchup, yellow mustard, Worcestershire sauce, and chopped pickles into the cooked beef. Remove from heat and let cool slightly.
04 - Flatten each biscuit round. Place 1 tablespoon beef mixture and 1/2 tablespoon shredded cheddar in the center. Add a mozzarella cube.
05 - Wrap the dough around the filling and pinch to seal, shaping into a ball. Set seam-side down on the prepared baking sheet.
06 - Brush each dough ball with beaten egg and sprinkle with sesame seeds.
07 - Bake for 15 to 18 minutes until the outside is golden brown.
08 - Let the bombs cool for several minutes before serving. Offer with classic burger sauces for dipping.