Apples and cheddar are a match made in heaven ... Spread a generous layer of butter on one side of each bread slice. Divide cheese, apple mixture, and arugula evenly on buttered sides of four ...
2. Assemble the Sandwiches: Spread a thin layer of butter on one side of each bread slice. On the unbuttered side, spread Dijon mustard (if using), then layer slices of cheddar, apple, and ...