Prepare baking sheets by lining them with parchment paper. prep

Combine butter, sugar, and vanilla in a food processor or mixer, then sift in strawberry powder and blend until fully smooth and evenly pink. mix

Add flour and pulse briefly until the dough begins to clump together without overmixing. mix

Transfer dough to a floured surface and gently knead until smooth, then shape into a flat disk, wrap, and chill until firm. prep

Set the oven to 350°F so it is ready for baking. prep

Roll chilled dough to ¼-inch thickness and cut into shapes using a cookie cutter. assemble

Optionally chill the shaped cookies briefly to help them hold their form. prep

Bake cookies just until set and pale, adjusting time slightly for texture preference. bake

Allow cookies to cool slightly, then brush edges with egg white and roll in sparkling sugar before letting them dry. finish