01 -
Preheat oven to 350 degrees. Place parchment paper in the bottom of a 9 inch cake pan and grease the sides
02 -
Combine the flour, baking soda, cocoa powder and salt in a medium bowl and set aside
03 -
Add the butter and sugar to a mixing bowl and beat until light and fluffy, about 2-3 minutes
04 -
Add the egg and mix until well combined
05 -
Add the vanilla extract, vinegar and red food color and mix until well combined
06 -
Add the dry ingredients and mix just until well combined
07 -
Stir in the white chocolate chips. Keep some aside to press into the top of the cookie once in the pan, if desired
08 -
Press the dough evenly into the prepared cake pan. It can be a little sticky so I use my offset spatula to press it in and smooth it
09 -
Bake for 18-20 minutes or until the edges are set and the center looks just matte
10 -
Remove from the oven and allow to cool completely in the cake pan, then transfer to serving plate
11 -
To make the frosting, beat the cream cheese and butter until smooth
12 -
Slowly add 1 cup of powdered sugar. Mix until combined
13 -
Mix in the vanilla extract
14 -
Add the rest of the powdered sugar and mix until smooth
15 -
Pipe the frosting onto the edges of the cookie cake and add some sprinkles, if desired, then store in an airtight container until ready to serve