01 - In a large bowl, combine flour, yeast, salt, and sugar. Stir in warm water and melted butter. Mix until a shaggy dough forms, then knead by hand or mixer for 5–7 minutes until smooth. Cover and let rest 15 minutes.
02 - While dough rests, cook ground beef and onion in a skillet over medium heat until beef is browned and onion is soft, about 5 minutes. Drain excess fat. Stir in salt, pepper, garlic powder, ketchup, mustard, and pickles. Remove from heat and let cool slightly. Stir in shredded cheddar.
03 - Preheat oven to 425°F. Line a baking sheet with parchment. Divide dough into 16 equal pieces. Flatten each into a round. Place 1 tablespoon of filling in the center, pinch edges to seal, and roll into a ball.
04 - Bring water to a boil in a large pot. Carefully add baking soda. Boil each dough ball for 20 seconds, then remove with a slotted spoon and place on prepared baking sheet.
05 - Brush each bomb with beaten egg and sprinkle with coarse salt. Bake 12–15 minutes until deep golden brown.
06 - Serve warm, optionally with extra ketchup or mustard for dipping.