Preheat the oven to 350 F degrees.
In a large bowl, add all dry ingredients and whisk to blend.
In a medium bowl, add all wet ingredients and blend.
Pour wet ingredients into dry ingredients and mix.
Put paper cupcake wrappers into each cup in a muffin tin.
Fill each cup 3/4 with batter.
Bake 15-20 minutes until done.
Put all ingredients into a large bowl.
With an electric mixer, whip until light and fluffy.
Spread on top of each cupcake.
Sprinkle Butterfinger Crumbles on top.