Whip together butters and cream cheese until fully combined and fluffy.
Add powdered sugar slowly, and mix until incorporated.
Add your flavors and 3 tbsp of heavy whipping cream. Whip until light and fluffy. Add more cream if necessary to thin to desired consistency. Whip well after each addition to fluff your buttercream.
Use to decorate Red Hot Sugar Cookies!
Store decorated cookies and any leftover icing in the refrigerator.