01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Heat a skillet over medium. Sauté onion until translucent, about 3 minutes. Add ground beef, garlic powder, salt, and black pepper. Cook until beef is thoroughly browned, then drain excess fat.
03 - Blend in ketchup, yellow mustard, Worcestershire sauce, and chopped pickles. Remove skillet from heat and allow filling to cool slightly.
04 - Flatten each biscuit round. Place 1 tablespoon of beef mixture and 1/2 tablespoon shredded cheddar in the center. Top with a mozzarella cube.
05 - Encapsulate fillings by wrapping dough around, pinching edges to seal, and form a ball. Arrange seam-side down on prepared baking sheet.
06 - Brush each bomb with beaten egg and sprinkle with sesame seeds.
07 - Bake for 15 to 18 minutes or until tops are golden brown.
08 - Let bombs cool slightly before serving. Complement with extra burger sauces for dipping if desired.