Portabella Mushroom Burger

1 tablespoon olive oil
1 large portabella mushroom , stem removed
1 dash garlic salt
1-2 dash worcestershire sauce
1 sprig parsley , fresh cut up
1 slice swiss cheese
1 hamburger bun

Heat oil for 1 minute in a skillet. Lay mushroom in pan and sprinkle with garlic salt, Worcestershire sauce and parsley. Cook 2 minutes on each side, or until lightly browned. Cover pan, lower heat to medium and cook 5 minutes. Place cheese over mushroom. Cover and cook until melted.