1. If using fresh strawberries, add the strawberries to a food processor or blender and puree until smooth. You should have about 3/4 cups of puree.
2. Add the puree to a small sized saucepan and cook over medium heat. Allow the mixture to come to a slow boil, stirring consistently to keep it from burning, until it has thickened and reduced to about 6 tbsp, about 10-15 minutes. To measure, pour the puree into a measuring cup. If it’s more than 6 tbsp (between 1/4 and 1/2 cup), add it back to the pan and continue cooking.
3. When the puree has thickened and reduced, pour into a large measuring cup and allow to cool to at least room temperature. This strawberry mixture can be made ahead, if you like, and stored in the fridge.
4. If using freeze dried strawberries, add them to a food processor and grind into a fine powder. Set aside.
5. Regardless of which version you’re making, add the butter to a large mixer bowl and beat until smooth.
6. Add about half of the powdered sugar and beat until well combined and smooth.
7. If using the strawberry reduction, add about 3 tablespoons of the reduction and beat until well combined and smooth. If using the freeze dried strawberries, add the powder and about 3 tablespoons of water or cream and beat until well combined and smooth.
8. Add the vanilla extract and slowly add the remaining powdered sugar and beat until well combined and smooth.
9. Add additional strawberry reduction/milk or cream until your frosting is the right consistency. Use your frosting on cakes, cupcakes, etc. Frosting can be left at room temperature for 1-2 days, but if you aren’t using it right away, I recommend refrigerating it for up to a week or freezing it for about a month.