Step 1

Preheat a waffle maker on medium-low heat.

Step 2

Spread each slice of bread with the horseradish mayonnaise. Place a piece of cheese on top of each slice.

Step 3

Add the roast beef and pepperoncini to one side. Close the sandwich and butter the top with 1 tablespoon butter.

Step 4

Set the sandwich, butter-side down, in the waffle maker. Spread the remaining butter on top of the sandwich and close the waffle maker.

Step 5

Toast until golden and crisp, 2 1/2 to 3 minutes.

Step 6

Remove, slice in half and serve with potato chips.