Instructions

COOKIE CAKE

1. Adjust an oven rack to the middle position and heat your oven to 350 degrees.
   Prepare  a 9-inch round cake pan with parchment paper on the bottom and spray the sides of the cake pan with baking spray. Set aside.
2. In a medium-sized bowl, combine the flour, baking soda, cornstarch and salt. Set aside.
3. In the bowl of an electric stand mixer, cream the butter and sugar together until light and fluffy, about 3 to 4 minutes. Scrape down the sides of the bowl.  Add the egg and vanilla extract and mix until well combined. Add the flour mixture to the butter mixture and beat until well combined. The dough will be crumbly at first. Use a silicone spatula to bring it together. Stir in the white chocolate chips and sprinkles. The dough will be thick.
4. Press and spread the cookie dough evenly into the cake pan, and add a few more white chocolate chips into the top of the cookie and gently press them into the dough. Bake for 20 to 25 minutes until the edges turn light gold. The center may not be set but will firm up as it cools.
5. Remove the cookie cake from the oven and allow to cool in the pan for 2 to 3 hours. Loosen the cookie cake from the sides of the pan with a small cake spatula or knife. Remove the cookie cake from the pan by placing a plate or cake circle over the top of the cake pan and flip over. Next, choose the serving platter you wish to serve on and place that on top of the cookie cake and carefully flip over.

BUTTERCREAM

1. In a large bowl beat together the butter and shortening until smooth. Add 1 cup of powdered sugar and beat until smooth. Add the vanilla extract and 1 to 2 tablespoons water and mix until smooth.  Add the remaining 1 cup powdered sugar and mix until combined.
2. Color the frosting with gel food coloring. I used Forest Green by Americolor. Fit a piping bag with Wilton  piping tip #1M and fill bag with buttercream. Pipe buttercream in small swirls that resemble Christmas trees. Sprinkle Christmas sprinkles on top of the frosting Christmas trees for ornaments. Top each frosting Christmas tree with a red hot candy.