Add bacon to a large non-stick pan and fry over medium heat until both sides are crispy and the fat has rendered down. Remove bacon and leave the fat behind (discard some if more than 1tbsp or so).
Lightly butter one side of each slice of bread. Flip them over so they're butter-side-down. Spread peanut butter over all four slices, then top two of them with banana then bacon. Place the other slice on top butter-side-up.
Add to the pan with the leftover bacon fat and fry both sides over medium heat until golden, with the peanut butter just starting to leak out. Serve up and enjoy!
Quick Demo
Notes
a) Do I have to add bacon? - There's dispute over whether the addition of bacon is traditional or not, some don't add it. Personally I think it's what makes the sandwich - it creates a gorgeous salty/sweet contrast, so definitely add it if you can. You can make the sandwich without, but I warn you it won't be as good!b) Peanut Butter - Most recipes use smooth, but I prefer crunchy. Story has it he loved a lot of it, so don't hold back!c) Calories - based on 4 tsp butter and 2 slices bacon per sandwich:
* Percent Daily Values are based on a 2000 calorie diet.
*Nutrition is based on the absence of salt unless stated as a measurement in the ingredients. Cost is worked out based on ingredients bought from UK supermarkets, then divided by the number of servings. In both instances these values are just for guidance. Please check out my FAQ Page for more info.