01 -
In a small bowl, mix mayonnaise, stone ground mustard, and prepared horseradish until smooth.
02 -
Place the bottom and top buns in the air fryer basket and spread the sauce on each bun half.
03 -
Place a slice of Swiss cheese on each bun. Add approximately five slices of roast beef on each bottom bun.
04 -
Cook in an air fryer at 370°F for 4 to 6 minutes until the meat is warmed and cheese melted. Remove top buns if over-browning.
05 -
Repeat the process for remaining sandwiches and serve hot.