In a small bowl stir together flour, baking soda, cinnamon and salt. Set aside.
In an electric mixer bowl, mix together the peanut butter, brown sugar, white sugar, egg and vanilla until smooth and well blended.
Mash the bananas and then fold them into the wet mixture.
Ad the flour mixture and beat on medium low until just just combine. Some lumps are ok.
Pour batter into a greased 9X5X3 loaf pan. Bake at 350° for 1 hour to 1 hour 20 minutes.
I know that sounds vague but every oven varies and you don’t want your bread to be over or under baked. A tooth pick should come out clean but just clean.
Run knife around edges and let cool completely in pan.
Put peanut butter, butter and confectioners sugar in a microwave safe bowl. Microwave and stir, in 30 second intervals, until smooth.
Pour glaze over top of turned out bread. Garnish with chopped peanuts. Let set for 10 minutes to set up before slicing.