Step 3: Make the sandwich
Now, you will generously butter both sides of your sourdough bread with the Parmesan butter you prepared earlier. Next, on top of the buttered sourdough, you will place your ingredients in the following order-
1. Sharp cheddar cheese
2. Apple slices
3. Bacon slices
4. (optional) more Apple slices
5. Sharp cheddar cheese
Placing the cheese on the outside, I have found, enables it to melt better around the apples and bacon, encasing them in a cloak of gooey cheddar.