Cupcakes
1-Fill two cupcake tins with cupcake liners: Fill two cupcake tins with cupcake liners. Preheat the oven to 350 degrees.
2-Whisk the milk, egg whites, and vanilla: Whisk the milk, egg whites, and vanilla together in a medium bowl.
3-Combine the baking powder, sugar, and flour: Combine the baking powder, sugar, and flour in a separate bowl. Once combined, add the wet ingredients to the dry and stir to combine.
4-Add in the softened butter and mix: Add in the softened butter and mix until just incorporated.
5-Using a cookie scoop or a 1/4: Using a cookie scoop or a 1/4 cup measuring cup, fill each of the prepared muffin cups about 2/3 full to allow the cupcakes room to rise.
6-Put the cupcakes in the oven and: Put the cupcakes in the oven and bake the cupcakes for 16-18 minutes or until a toothpick placed into the center of the cupcake comes out clean.
7-Use a spoon, cupcake corer, or piping: Use a spoon, cupcake corer, or piping tip to take out a small section in the middle top of the cupcakes. Fill the cupcakes with banana pudding just to right underneath the top of the cupcake. Replace the piece removed on top of the banana pudding.
8-Frost each cupcake then top with a: Frost each cupcake then top with a Vanilla Wafer and slice of banana then serve immediately.

Filling
9-Whisk the two packages of pudding mix: Whisk the two packages of pudding mix with the four cups of milk. Place in the fridge to set for 10-15 minutes.
10-Add diced bananas to the pudding and: Add diced bananas to the pudding and place back in the fridge.

Frosting
11-Place your mixing bowl and a whisk: Place your mixing bowl and a whisk (or your beaters) in the freezer for 15-30 minutes to allow them to chill.
12-Place all of the ingredients in the: Place all of the ingredients in the cold bowl and beat them either by hand or with an electric mixer until stiff peaks form.
13-Place frosting in a piping bag fitted: Place frosting in a piping bag fitted with a large cupcake decorating tip.