Mini Rhubarb and Raspberry Galettes

Divide dough evenly into 8 pieces. On a lightly floured surface, roll out each piece to a 7-inch round, 1/8 inch thick. Transfer rounds to 2 large parchment-lined rimmed baking sheets, arranging several inches apart. (If rounds become too soft to handle, refrigerate until firm, about 20 minutes.)

In a large bowl, toss to combine rhubarb, raspberries, cornstarch, and granulated sugar.

Cover each round of dough with a heaping 1/2 cup rhubarb mixture, leaving a 1-inch border. Fold edges over rhubarb filling, leaving an opening in center; gently brush water between folds, and press gently so that folds adhere. Refrigerate or freeze until firm, about 30 minutes.