Step 1

Preheat oven to 350F and line a cupcake pan.

Step 2

In a bowl of a mixer, beat butter and sugar until smooth. Add egg and mix until incorporated.

Step 3

In a medium-sized bowl, whisk to combine flour, cornstarch, baking powder, baking soda, and salt. Set aside.

Step 4

In a measuring cup, combine sour cream, vegetable oil, vanilla extract, and milk.

Step 5

Add the dry ingredients the butter mixture and while the mixer is running on low, slowly add the milk mixture. Mix until combined.

Step 6

Fill cupcake liners 3/4 way full and bake for 14 - 16 minutes. They are done when they are lightly golden brown and when a toothpick comes out without wet batter stuck to it.

Step 7

Let cupcakes cool completely before frosting.

Step 8

8 pieces white rabbit candy

Step 9

2 tablespoon milk

Step 10

2/3 cup unsalted butter, at room temperature

Step 11

2 cups icing sugar

Step 12

1 teaspoon vanilla extract