Begin by placing your softened unsalted butter into a large mixing bowl.
Using an electric mixer (or a stand mixer with a paddle attachment), beat the butter on medium speed for about 3 minutes. You'll see it transform into a lighter color and a wonderfully smooth texture, making a perfect airy base!
Next, gently add the sugar-free powdered sweetener to the bowl. Mix on low speed for 1 minute to incorporate, then increase to medium speed and continue mixing for another 1-2 minutes until the mixture is light and fluffy.
Now, pour in the heavy whipping cream and vanilla extract, then sprinkle in the pinch of salt.
Continue mixing on medium speed until all ingredients are perfectly combined and you achieve a smooth, creamy, and delightful frosting consistency.
For chocolate frosting: Simply add ½ cup of sifted cocoa powder along with the powdered sweetener in step 3. If your frosting becomes too thick, just add a tiny bit more heavy cream, a teaspoon at a time, until it reaches your desired spreadable consistency.
This delicious, guilt-free frosting is ready to elevate about a dozen cupcakes or your favorite keto dessert!