Preheat oven to 350 degrees F. Line a cupcake pan with paper liners. Set aside.
In a small bowl, mash 3 bananas to make ~1 cup.
In a large bowl, combine white sugar, shortening, bananas, baking soda, baking powder, vanilla, eggs, and salt. Gradually add flour a little at a time until just combined, do not over mix.
Fill prepared pan ~⅔ of the way full. Bake for 20-22 minutes.
Reduce heat to 225 degrees, and bake for an additional 10 minutes.
Cool completely.
For the Icing/Topping
In a large bowl, cream butter. Stir in salt and vanilla. Add powdered sugar a little at a time. Add cream as needed to reach your desired consistency.
Pipe or spread onto cupcakes. Crush ~½ box of vanilla wafters using a rolling pin or food processor. Sprinkle on top of cupcakes.