Preheat oven to 425 degrees. Prepare your sandwich with mayo, and layer your favorite meat and cheese.  Then add the barbeque sauce and top with the other slice of bread.  Spread a thin amount of butter on the outside of the bread; you must do both slices. Trust me!  Then put sandwiches on a baking sheet and place in the oven.  Cook for about 5 minutes per side.  Be sure to flip them over when the top is golden brown.  Watch carefully so they don’t overcook.  They are done when the cheese is melted and they’re golden brown.