In food processor, pulse 1 cup (250 mL) DORITOS^® Nacho Cheese Flavored Tortilla Chips to make fine crumbs (you should have about 1/3 cup/75 mL); set aside.

In bowl, combine DORITOS^® crumbs, flour and icing sugar; set aside.

Using electric mixer, beat butter and vanilla until blended. Beat in flour mixture on low speed until combined. Fold in chocolate chunks. Pat dough into 1/2-inch (1.5 cm) thick disk. Wrap in plastic wrap and refrigerate for 1 hour.

Preheat oven to 325°F (160°C). On lightly floured surface, roll out dough into 12- x 8-inch rectangle, about 1/4-inch (5 mm) thick. Cut dough in half lengthwise to form 2 rectangles. Cut each rectangle into 4 even triangles using sharp knife.

Transfer to parchment paper–lined baking sheet, about 2 inches (5 cm) apart. Refrigerate for 10 to 15 minutes.

Bake for 8 to 10 minutes or until slightly golden on bottom and tops are set. Transfer to rack; let cool completely.

Spread icing evenly over each cookie. Break remaining DORITOS^® Chips into small pieces; decorate cookies with DORITOS^® Chips pieces and dragées.

Substitute vanilla extract with 1/2 tsp (2 mL) almond extract if desired.

Alternatively, decorate cookies with different colored icings and omit sprinkles.

Cut out cookies with a tree-shaped cookie cutter before baking if desired.