1. Preheat oven to 350. Prepare muffin tin by inserting cupcake liners or spraying with cooking spray. 

2. Add white whites to the mixture one at a time, mixing well after each addition. 

3. Stir 1/3 of the flour into the mixture followed by half of the milk, then another 1/3 of flour, the remaining milk,and then remaining flour. Be sure to scrape the sides of the bowl and bottom during this process.

4. Spoon batter into muffin tins, filling 3/4 full. bake 15-18 minutes. The cupcakes are done when a tooth pick inserted comes out clean. 

How to fill cupcakes with sprinkles

1. Use a  knife to cut a hole into the center of the cupcake about 1 inch deep.

2. The piece you removed will be the shape of a cone. Set it aside.

3. Place about one heaping teaspoon of sprinkles inside the cupcake. Slice off the pointy end of the "cone" piece of cupcake you removed so that it can fit on top of the sprinkle filling
4. 
   

Frosting

1. Using a mixer fitted with a paddle attachment, beat the butter on medium speed until creamy - about 2 minutes.

2. Add 4 and 1/2 cups confectioners' sugar, salt,  heavy cream, and vanilla with the mixer running on low. Increase to high speed and beat for 3 full minutes. Add up to 1/2 cup more confectioners' sugar if frosting is too thin or another Tablespoon of cream if frosting is too thick. 

3. If you are making different color frostings, divide into separate bowls, adding food color and stirring until incorporated.

4. Pipe the frosting on the cupcakes, making sure to cover the cut marks.