Mix flour, 2 cups powdered sugar, and NESTLÉ® ABUELITA™ chocolate mix in medium bowl. Place shortening in large mixer bowl. Beat at medium speed, adding flour mixture gradually until combined. Add vanilla extract and beat until combined. Freeze for 7 to 10 minutes.
Shape 1 tbsp dough into ball; repeat with remaining dough. Place balls 1-inch apart on ungreased baking sheets and press lightly to flatten.
Bake for 16 to 18 minutes. Cool on baking sheets for 1 minute. Remove to wire racks to cool completely. Dust with remaining ¼ cup powdered sugar.