Chocolate Funfetti Cookie Stack Cake

Directions

1. In a large bowl, sift together flour, cocoa, baking soda, and salt; set aside.
2. In a very large bowl, beat together butter and sugars until creamy, about 2-3 minutes. Beat in eggs, yolks and vanilla until just incorporated. Gradually stir flour mixture into the butter mixture until combined. Stir in cupcake bites and white chocolate chips.
3. Scoop into walnut-sized balls using a medium cookie scoop, place on a plate or tray, cover, and refrigerate for at least 30 minutes - 2 hours (overnight best). 
4. When ready, preheat oven to 375 degrees. Line cookie sheets with parchment paper or silicone baking mat, set aside.
5. Place on prepared cookie sheets about 2 inches apart. Bake 8-10 minutes. Allow to cool for 5 minutes on cookie sheets before transferring to wire racks to cool completely.
6. While the cookies cool, prepare the buttercream. In a large bowl, beat butter and shortening on medium speed until smooth. Turn mixer to low and slowly add in your powdered sugar and dry cake mix.
7. Turn speed up to medium and beat for 1 minute until smooth. Add in milk and continue mixing until desired consistency is reached. Add sprinkles if using and transfer to a pastry bag fitted with a wide tip, or place in zip top bag and cut off the corner.
8. To assemble the cookie cake, refer to diagram provided by Erica’s Sweet Tooth and follow these instructions: Start by arranging a circle of six cookies on your cake plate with one in the center (7 total). Pipe a thick ring of buttercream on that layer.
9. Place the next layer of cookies on top, staggered from the layer below (refer to diagram for help). Leave the center cookie empty this time and fill that space with buttercream, as well as adding another ring of buttercream around the circle of cookies.
10. Continue building layers until you run out of cookies or you reach desired height (I made 6 layers and used 42 cookies). Top with a mound of buttercream, one more cookie and sprinkle with cupcake bites, white chocolate chips, and sprinkles.
11. Slice like a cake and serve!