Add the remaining ingredients, and beat with your fork or mixer until you have a light, fluffy frosting.
If your frosting is too thin, add more powdered sugar by the tablespoon, beating between additions, until it thickens up. Too thick? Add vegan milk by the tablespoon, beating between additions, until it's nice and fluffy.
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Notes
This recipe makes about 2 cups of frosting.Your vegan butter is ready to use when a fork or butter knife easily slides into the center.The peanut butter you choose can make or break this recipe. If it separates at room temperature, then don't use it for this frosting.Vegan peanut butter frosting will keep for about a week in the fridge.recipe veganized from Sally's Baking Addiction.