Easy, 5-ingredient dairy-free chocolate buttercream frosting that's perfect for filling and decorating cakes.
In a large bowl, mix together the butter and vanilla extract.
Add the icing sugar and cocoa powder in a little bit at a time. Use the soy milk to loosen it as needed.
Once all of the icing sugar and cocoa powder is used up, give the buttercream a quick mix with an electric whisk or stand mixer until fluffy. Add more icing sugar or soy milk to thicken/loosen it if needed.