Preheat oven to 350 degrees. Coat a 12-cup muffin tin with cooking spray. Line the cups with cupcake paper.
In an electric mixer or using a hand mixer, combine all the cupcake ingredients except the eggs and whites. Beat well.
Add the eggs, egg whites and mix well.
Fill each cup just to the top. Do not mound or overfill.
Bake for 25-30 minutes until a toothpick inserted comes out clean. Let them cool before frosting. Bake the remaining 6 cupcakes and cool.
To make the frosting: Using a mixer, whip the cream cheese until smooth. Add the powder sugar, milk and mix until smooth. It should be quite thick.
Frost each cupcake and decorate with sprinkles, if desired.
Store in the refrigerator.