Sauté mushrooms in 1 T butter until soft, drain liquid from pan, and set aside.

Mix ¼ cup butter with garlic and garlic powder. Spread butter mixture over bread slices.

Place a slice of fontina on each piece of bread. Spoon sautéed mushrooms over each slice of fontina. Place bread on a cookie sheet and bake in a 500º for 4 minutes, or until cheese has melted. Remove from oven and drizzle olive oil over tops. Sprinkle basil over top.