Ingredients

1-1/2 cups sliced fresh mushrooms2 tablespoons chopped onion1/2 cup mayonnaise, divided2 cups shredded cheddar cheese1/4 cup crumbled blue cheese1 teaspoon yellow or Dijon mustard1 teaspoon Worcestershire sauce1/4 teaspoon salt1/8 teaspoon cayenne pepper12 slices white or wheat bread2 to 4 tablespoons butter

Preparation

In a large skillet, saute mushrooms and onion in 3 tablespoons mayonnaise for 5 minutes or until mushrooms are tender; cool. In a large bowl, combine the cheeses, mustard, Worcestershire sauce, salt, cayenne, mushroom mixture and remaining mayonnaise. Spread 1/3 cup on six slices of bread

In a large skillet or griddle, melt 2-3 tablespoons butter. Toast sandwiches until bread is lightly browned on both sides and cheese is melted, adding butter if necessary.