First put the toast into the oven and lightly bake for a few minutes, till the surface is slightly hard, then spread peanut butter and readily cut banana pieces onto it.
Cook the bacon, and put it on top of the banana pieces, you can sprinkle on some honey, then use another piece of toast to cover it.
Use a hot pan to melt the butter, put the sandwich into the pan and fry on both sides till golden brown and crispy then it's done.