In a large mixing bowl, cream together the salted butter and powdered sugar until fluffy and pale. Add vanilla extract and strawberry powder, mixing well.

Gradually add all-purpose flour to the mixture, mixing on low speed until just incorporated. The dough should be soft and slightly sticky.

Shape the cookie dough into a log, wrap tightly in plastic wrap, and refrigerate for at least an hour.

Preheat your oven to 350°F (175°C). Slice the log into ½-inch thick cookies, arrange them on a baking sheet, and bake until lightly golden, about 11-15 minutes.

Cool cookies for 10 minutes on the baking sheet before transferring to a wire rack. Melt white chocolate and drizzle over cooled cookies if desired.