1 Tbsp. butter 
2 slices rustic bread
 
3 thick slices high-quality pre-cooked bacon
 
3 thin slices Granny Smith apple 
2 Tbsp. Duke's mayonnaise (optional) 
2 oz. Swiss cheese or Gouda, thinly sliced
Directions
:
Take your cheese out of the refrigerator an hour ahead of  time -- it will melt more evenly that way. And use butter  at room temperature. 
Preheat the oven to 350.
Preheat an iron skillet over medium heat. 
Assemble the sandwich on a plate. Butter the outside of the bread and place the non-cheese ingredients between 2 slices of cheese to keep the bread from sliding off.
Add 1/3 tablespoon of the butter to the skillet and cook to brown. 
Lay the sandwich in the pan. Look for a really crusty dark brown on this first side. This  usually takes 1 1/2 minutes. 
Flip, then cook for an additional 30 to 45 seconds. 
Spread the remaining butter on the just-browned side, transfer  the sandwich to a baking sheet, and place in the oven for a few  minutes-how long you keep it in depends on how melty you like your  cheese. 
Pull out your masterpiece and let it sit for a minute before devouring. 

 
