Ingredients • 16 diagonal baguette slices (about 1/4” to 1/3”) • 3 tablespoons unsalted butter • 1 tablespoon flour • 1/2 cup porter • 1/4 cup milk (use whole milk for a creamier texture) • 1 teaspoon dry mustard • 1/8 teaspoon black pepper • 1 1/2 cups grated cheddar (sharper is better) • 1…