Prepare chai spice mix: Mix all of the chai spices together. You’ll have 2 and 1/8 teaspoons. You will use 1 and 3/4 teaspoons in the buttercream and have extra for garnish. If you don’t plan to use the extra chai spice mix for garnish, just beat it all into the frosting—the extra spice flavor is wonderful!

With a handheld or stand mixer fitted with a paddle attachment, beat the butter on medium speed until creamy, about 2 minutes. Scrape down the sides and up the bottom of the bowl with a rubber spatula. Add 5 and 1/2 cups (660g) confectioners’ sugar, the heavy cream, 1 and 3/4 teaspoons chai spice mix, the vanilla extract, and a pinch of salt. Beat on low speed for 30 seconds, then increase to high speed and beat for 2 minutes until combined and creamy. If frosting looks curdled or greasy, it’s best to beat in more confectioners’ sugar to smooth it out. Beat in up to 1/2 cup (60g) more confectioners’ sugar to smooth out if needed. If frosting seems too thick to pipe or spread, beat in another Tablespoon (15ml) of cream. Taste and beat in another pinch of salt if frosting is too sweet.

Use immediately or cover tightly and store for up to 1 day in the refrigerator or up to 3 months in the freezer. After freezing, thaw in the refrigerator then beat the frosting on medium speed for a few seconds so it’s creamy again. Adding a splash of heavy cream or milk will help thin the thawed frosting out again if needed.