Add buttermilk, vegetable oil, eggs, peppermint extract and vanilla extract, then using an electric hand mixer blend mixture until on low until combined then increase speed to medium and mix 2 minutes. Mix in boiling water.
Add remaining powdered sugar and mix on low speed until blended and increase to medium-high speed and whip until light and fluffy, while adding in additional cream 1/2 Tbsp at a time to reach the right consistency.
Cake recipe adapted from Hershey's
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