Billy's Vanilla Buttercream
Colored sprinkles, for decorating (optional)
1 cup (2 sticks) unsalted butter, room temperature
6 to 8 cups confectioners' sugar
1/2 cup milk
1 teaspoon pure vanilla extract
In the bowl of an electric mixer fitted with the paddle attachment, cream butter until smooth and creamy, 2 to 3 minutes.
With mixer on low speed, add 6 cups sugar, milk, and vanilla; mix until light and fluffy.
If necessary, gradually add remaining 2 cups sugar to reach desired consistency.