1tablespoon (15mL)non-dairy milk*, plus more as necessary
Instructions
Place the softened butter into a large mixing bowl or the bowl of a stand mixer fitted with a paddle attachment. Beat for a few minutes, until light and fluffy.
Add the powdered sugar, vanilla extract, and 1 tablespoon of milk and beat again, until light and fluffy. If necessary, mix in more milk, approximately 1/2 tablespoon at a time, until the desired consistency is reached. Scrape the sides as necessary.*
To remove air bubbles, use a rubber scraper to stir the buttercream a bit and press it up against the sides of the bowl.
Notes
Vegan Butter: I recommend using vegan buttery sticks rather than margarine from the tub.
Softened Butter: The butter should be soft enough to whip up. I recommend bringing it out of the fridge about 15-30 minutes before using, unless the butter is soft right out of the fridge.
Non-dairy Milk: I recommend using soy or oat milk because of their flavor and thickness, but you can use your favorite non-dairy milk or creamer.
Buttercream Consistency: You want the buttercream to be creamy and whipped, but firm enough to frost and pipe. You can add extra non-dairy milk to make it softer and creamier, or extra powdered sugar to stiffen it up.