In a bowl and with an electric mixer, blend together the butter until creamy. Add the marshmallow cream and cream until smooth. Add the salt, vanilla extract. In a ziploc bag crush some strawberries until small pieces. Add the berries to the butter and cream until smooth. Keep cold until ready to serve.
If you want to use Thrive Life Powdered Butter you can use about a cup of the butter powder and only a couple tablespoons of water, or until the butter is smooth and creamy. Make the rest of the recipe as indicated above.