Preheat oven to 350 degrees F. Cream the butter and sugar until smooth. Add eggs until smooth. Add peanut butter, cinnamon, baking soda, salt, pudding mix and flour until combined. Stir in bananas and Reese's.
Pour batter into 3 greased bread pans. Bake 45-60 minutes or until toothpick comes out clean from center of each loaf. Let cool.
Place powdered sugar, milk and peanut butter in a bowl. Whisk until smooth and drizzling consistency.