Creating a Roast Beef & Cheddar Melt is easy if you follow these simple steps:

1. Preheat the Skillet: Heat a non-stick skillet over medium heat.
2. Butter the Bread: Spread butter on one side of each slice of bread.
3. Assemble the Sandwich: Place two slices of bread, buttered side down, in the skillet. Layer with roast beef and cheddar cheese.
4. Add Additional Toppings: If desired, spread mayonnaise or mustard on the unbuttered side of the other slices of bread, then place them on top of the cheese.
5. Cook the Sandwich: Cook for about 3-4 minutes until the bread is golden brown. Carefully flip the sandwich and cook the other side for another 3-4 minutes, pressing down gently with a spatula.
6. Melt the Cheese: Ensure the cheese is fully melted and the bread is toasted to your liking.
7. Remove and Slice: Once cooked, remove the sandwich from the skillet and let it cool for a minute before slicing it in half.
8. Serve: Plate the sandwich and enjoy!

Following these steps will lead you to create an incredible Roast Beef & Cheddar Melt that everyone will love.