You will use this to make a smaller cake later, so keep this portion separate from the other batter.

If you have leftover batter, you can use it to make cupcakes.

If you’re making the cake on the same day, let it cool to room temperature before frosting it. Times vary depending on the heat of your kitchen, but it will generally take an hour or more. [11] X Research source

Set this frosting aside for now.

For best results, use room temperature butter.

Make sure the pie tin you use is slightly smaller than the circular cake, as the circles are Minnie’s ears.