In a large bowl, combine cake mix, buttermilk, eggs, sour cream, vegetable and vanilla extract on low speed until moistened. This should take about 30 seconds.

Then beat the cake batter on medium speed for about 2 minutes.

Bake for 16-20 minutes or until a toothpick inserted in the middle of a cupcake comes out clean.

Cool the cupcakes in the pan on a wire rack for 15 minutes. Then take the cupcakes out of the pan and allow them to cool completely. This should take about 30 minutes.

Empty each container of vanilla frosting into a medium mixing bowl.

Use the hand mixer to beat one bowl of frosting at medium speed until it’s light and fluffy and has doubled in size,. This usually takes about 2 minutes.

In the other bowl of frosting, add several drops of blue gel food coloring. Then use the electric mixer to beat the frosting until it’s also light and fluffy.

Spoon the blue frosting into one side of a piping bag with a frosting tip.

Turn the piping bag and spoon in the white frosting in the other side of the bag.

Frost the cooled cupcakes and enjoy!