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 ...
Method— 1. Caramelize the Onions (optional): In a skillet, heat a little butter or olive oil over medium-low heat. Add thinly sliced onions and cook for 20-25 minutes, stirring occasionally ...