- 1 lb (450g) ground beef (or a mix of beef and pork)
- 1/2 cup breadcrumbs (or crushed crackers)
- 1 egg, beaten
- ¼ cup milk
- 1 tablespoon Worcestershire sauce
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- ½ teaspoon paprika
- ½ teaspoon salt
- ¼ teaspoon black pepper
For the Cheese Filling:
- 4 oz cheddar, mozzarella, or Monterey Jack cheese, cut into small cubes
For the Topping:
- ½ cup ketchup
- 1 tablespoon brown sugar
- 1 teaspoon mustard (optional)