In a large bowl mix together beef, garlic powder, Worcestershire sauce, salt and pepper. Break into 4 equal portions, and form into a bowl. You can use a can or a jar to help form them.

Melt butter in a pan/skillet and sauté the mushrooms, season with salt and pepper to taste.

In each bowl layer cheese, mushrooms, bacon and more cheese.

Place on a baking sheet with tin foil, tent with another sheet and bake for 20 to 25 minutes.