Mix in the cocoa powder, vanilla, and salt on low until smooth. Scrape down the sides of the bowl.
60 grams cocoa powder, 2 teaspoons vanilla extract, ½ teaspoon salt
Gradually add powdered sugar, mixing it in on low speed 1 cup at a time until combined. Scrape down the sides between each addition so everything is fully mixed.
600 grams powdered sugar
Increase the mixer to medium-high speed until the frosting is light and fluffy. If using for a cake, reduce the speed to low to remove air bubbles.
Spread the frosting on cakes and brownies with an offset spatula or add it to a piping bag with a piping tip for cupcakes. Enjoy!
Notes
1 serving in the Nutrition section is about ½ cup of frosting.Storage: Store in an airtight container in the fridge for up to 5 days. Let it sit at room temperature for 30 minutes-1 hour before using, then re-whip if needed.Freezing: Transfer to a sealed container or freezer-safe bag. Freeze for up to 3 months. Thaw in the refrigerator overnight and re-whip it with an electric mixer after thawing.