Prep the strawberries: Add the freeze-dried strawberries to a plastic bag and use a rolling pin to crush them into a fine powder. (A food processor works too if you want to save time!)
Mix the base: In a large bowl, use a hand mixer or stand mixer to blend the softened butter, 1 cup of powdered sugar, vanilla extract, and salt until smooth.
Incorporate the strawberry powder: Scrape down the sides, then gradually add the remaining powdered sugar and the strawberry powder, mixing as you go. Stop to scrape down the sides as needed.
Adjust the texture: Slowly mix in the milk, one tablespoon at a time, until the frosting reaches your desired consistency. You might not need all the milk, so add it gradually.
Frost and enjoy: Spread the frosting onto a completely cooled cake. Slice, serve, and enjoy every bite of this sweet, berry-packed treat!
