Paula Deen's Grilled Apple, Bacon, and Cheddar Sandwich with Roasted Red Onion Mayo

Okay, I realize that to call this simply a grilled cheese sandwich is a bit like calling Multi BIS/Ch. Chudrinka's Dance In The Wind SDX by the name Breezy. But that's a really long name for a sandwich. Even it's acronym, PD's GABCSRROM, doesn't work. So, grilled cheese it is. Albeit a more flavorful, filling, delicious grown up version of your basic grilled cheese sandwich that Big pup lives on. But whatever you call it, it is heavenly.

2 slices thick cut sourdough or another hearty bread (I used wheat)
4 slices thick cut bacon, cooked crisp
4 slices of cheddar cheese
1/2 Granny Smith apple, cored, sliced thin
1 medium red onion, chopped
2 tsp olive oil
1 cup of mayo
salt and pepper
butter

Toss onion, oil, salt and pepper together on small rimmed baking sheet. Roast in the oven for 25-30 minutes stirring occasionally. Remove, let cool. Transfer to a blender, add mayo and pulse till smooth and creamy.

Heat skillet over medium heat. Spread 1 slice of bread with red onion mayo, top with 2 slices of cheddar, then the bacon, next the apple slices, the rest of the cheddar, finishing with another slice of bread that's been slathered with red onion mayo. Butter the outside of each slice of bread and add to the hot skillet. It's easier to build this sandwich in the skillet.