Cut butter into flour mixture with a pastry blender or 2 forks until crumbly.
Whisk together yeast and warm milk.
Let stand 10 minutes. (
Mixture does not foam.) Stir in egg and vanilla.
Add milk mixture to flour mixture, stirring until dry ingredients are moistened. Divide dough into fourths; wrap each portion in plastic wrap, and chill 30 minutes.
Roll each portion of dough to 1/8-inch thickness on a flat surface lightly dusted with powdered sugar.
Cut into 3-inch squares. Spoon 1 heaping teaspoonful of apricot or cherry dessert filling in center of each square.
Fold 2 opposite corners to center, slightly overlapping.
Place on parchment paper-lined baking sheets.
Bake at 350 for 18 to 20 minutes or until lightly golden. Cool cookies on baking sheet 5 minutes.
Remove to wire racks, and let cool completely.
Sprinkle cookies with powdered sugar before serving.
Note: For testing purposes only, we used Solo Filling for Pastries, Cakes, and Desserts.
Snowflake Cookies: Omit dessert filling. Prepare and roll out dough as directed.
Cut dough with a 3 3/4-inch snowflake-shaped cookie cutter.
Place on parchment paper-lined baking sheets.
Sprinkle with sparkling sugar.
Bake at 350 for 10 minutes or until lightly golden. Cool cookies as directed. Makes about 5 dozen. Prep: 20 min., Stand: 10 min., Chill: 30 min.,