In a bowl of a stand mixer fitted with a paddle attachment (or use a bowl and a hand mixer), add the flour, freeze-dried strawberry powder, salt and sugar. Mix well.
Add the butter and vanilla and mix until the butter has incorporated completely into the dry ingredients and the dough has formed.
Shape the dough into a 2 ½“ (6cm) thick log and wrap it with plastic wrap. Let it chill in the freezer for 20 minutes or in the fridge for one hour. You can also store the dough in the fridge overnight.
Preheat the oven to 355F (180C) and line a baking sheet with parchment paper.
When the dough is hard enough to cut with a knife, remove from the freezer and slice it into 14-16 slices approximately ¼” ( ½ cm) thick.
Place the cookies on the baking sheet leaving 1” in between (bake in two batches if needed) and bake for 10 -12 minutes or until the cookies are not shiny anymore, puffy, a bit spread out and golden around the edges.
Remove the cookies from the oven and let them cool down for 10 minutes on a baking sheet before transferring to a cooling rack to cool completely.