4 pretzel slider buns, recipe here
2 cups shredded or sliced corned beef
2-3 slices Swiss cheese
1/2 cup mayo
1/4 cup ketchup
2 tablespoons Dijon mustard

Preheat oven to 350 degrees. Combine mayo, ketchup, and mustard in a small bowl and mix well. Slice slider buns open and spread both sides with sauce. Layer on corned beef. Top with Swiss cheese, covering beef (1 slice will be too big for 1 slider, so cut in half or fourths to get just enough to cover the corned beef). Place assembled sandwiches in a baking dish with sides (a square Pyrex pan or even a cake pan will work well) and cover with aluminum foil. Bake for about 15 minutes. Remove and serve!