Ingredients
8 (1/2-inch-thick) slices sourdough sandwich bread, such as Pullman
3 tablespoons unsalted butter, room temperature
3 tablespoons mayonnaise
6 slices American cheese (3 ounces)
3 ounces sharp cheddar cheese, shredded (1 cup)
Preparation
Arrange bread in a single layer on a clean work surface. Stir together butter and mayonnaise. Spread mixture evenly onto one side of every slice (1 scant tablespoon per slice).
Heat a large skillet, preferably cast iron, over medium. Flip over bread on work surface (so it’s plain-side up). Place 1 1/2 slices American cheese on 4 slices, and 1/4 cup cheddar on remaining 4 slices. Carefully sandwich together.
Place sandwiches in skillet (in two batches, if needed). Reduce heat to medium-low; gently top sandwiches with a lid slightly smaller than skillet for even cooking. Cook, flipping once halfway through, until crisp and golden on both sides and cheese is melted, 7 to 9 minutes. Serve immediately.
