Fluffy, pink, dairy-free strawberry frosting for filling and covering cakes.
Add the butter to a large bowl and stir in the icing sugar, a little at a time.
Add in the soy milk and strawberry powder. Mix well.
Give the buttercream a quick whisk with an electric whisk or stand mixer until soft and fluffy.
If the icing is still a little stiff, you can add a bit more plant-based milk. If it's too runny, add more icing sugar.