In the bowl of a stand mixer fitted with the paddle attachment, beat butter and cream cheese until light and fluffy - about three minutes on high speed.
Food process the freeze-dried strawberries until they form a powder.
Mix in powdered strawberries (you should have about 2 1/2 tablespoons) and salt until fully combined.
Mix in powdered sugar.
Spread or pipe onto your favorite cakes and cupcakes.
Notes
This recipe yields about two cups of frosting. This should be enough to frost twelve cupcakes. Double the recipe to frost a two layer eight-inch cake.
Make sure the cream cheese and butter are at room temperature.
Use unsalted butter so that you can control how much salt is in the recipe.