Preheat oven to 350°F

Silce onion garlic and mushrooms to 1/4 inch

Heat butter in a saute pan and add mushrooms onions and garlic slices saute until onions and garlic are transparent.set aside and reserve .

In same pan cook hamburger steaks about 5 minutes each side

Place Hambuger on buns and coat with marinara sauce and mozzarella cheese and bake at 350 ° F until cheese is melted ,

Add sauteed mushrooms and onions and cap with top bun and enjoy