Using your food processor, pulverize freeze dried strawberries until they become a powder.
If using a stand mixer, fit with paddle attachment.
Beat butter on high speed until smooth.
Turn mixer speed down to low. Slowly add in powdered sugar. Beat to combine.
Add in strawberry powder and beat to combine.
Add in heavy cream and beat to combine. Turn mixer speed up to high and beat for 1-2 minutes (this is to "whip" the heavy cream to make your buttercream fluffy).