Make the dough

• Warm the milk and stir in the yeast and sugar, then let it sit until foamy.
• Combine the bread flour, salt and garlic powder in a bowl.
• Add the yeast mixture, eggs and softened butter and knead into a smooth dough.

Let the dough rise

• Cover the dough and leave it in a warm spot until doubled in size.

Cook the beef

• Brown the ground beef in a pan with the smoked paprika, Worcestershire sauce, salt and pepper.
• Stir in the cheese slices until melted, then set aside.

Caramelize the onions

• Heat the butter and olive oil in a pan and add the diced onion with a pinch of salt.
• Cook, stirring, until soft and golden.

Mix the burger sauce

• Whisk together the mayonnaise, ketchup, yellow mustard, Worcestershire sauce, relish, salt and pepper.

Shape and fill the bombs

• Divide the dough into 8 equal pieces and roll each into a 5-6 inch circle.
• Spread burger sauce in the center, then top with grilled onions, ground beef and mozzarella.
• Pull the edges together and pinch to seal into a ball.

Bake

• Place the bombs on a lined baking tray and brush with the egg wash.
• Bake at 190 °C (375 °F) until golden brown.

Brush with garlic butter

• Melt the butter with the minced garlic and stir in the parsley.
• Brush the garlic butter generously over the warm bombs and serve.