These peppermint bark cookies are the ultimate Christmas cookies. They combine a buttery shortbread cookie base with creamy chocolate and crushed peppermint candies.
Move the oven rack to the middle position and preheat the oven to 350°F. Spray a 9x13-inch baking pan with nonstick cooking spray.
Whisk the flour, baking powder, and salt in a small bowl.
Add butter and sugar to a bowl of a stand mixer and mix on medium speed until light and fluffy, about 2 minutes.
Add egg and vanilla and mix until combined.
Add flour mixture and mix to combine (the dough should look crumbly).
Pat dough into the bottom of the prepared 9x13-inch baking pan.
Bake for 22-25 minutes, or until the edges are golden brown. Transfer the pan to a wire rack and cool for 1 hour.
Transfer the pan to a wire rack and cool for 1 hour.
Place chocolate chips and vegetable shortening in a microwave-safe bowl, and cook on 50% power for 1 minute. Stir and microwave for 30 seconds and stir. Repeat until chocolate is completely melted.
Spread the melted chocolate over the cookie crust in an even layer, and sprinkle crushed candy canes over the top.
Chill the pan in the refrigerator for 1 hour or until the chocolate is set.