Preheat oven to 350 degrees F. Line muffin tin with 12 cupcake liners or a mini muffin tin with 24 cupcake liners. Set aside.
Using your stand mixer or a hand mixer, beat the softened butter on medium speed for about 4 minutes, until smooth and creamy. With the mixer on low speed, slowly add in powdered sugar. Once the powdered sugar is fully incorporated, beat the butter and sugar on medium speed for an additional 3 minutes. Switch to low speed and add in vanilla, and 1 tablespoon of heavy cream until combined. Switch to medium-high speed until frosting is smooth and fluffy. You can add additional 1-2 tablespoons of heavy cream to reach desired consistency