Ingredients
2 teaspoons finely chopped fresh garlic
1 teaspoon onion powder
1
4 teaspoon salt1
8 teaspoon pepper2 tablespoons Land O Lakes® Butter
1 (8-ounce) package (2 cups) sliced fresh mushrooms
1 medium (1 cup) thinly sliced red onion
4 (3/4-ounce) slices Land O Lakes® Swiss Cheese
Lettuce leaves, if desired
4 hamburger buns