2 1/2 cups white or yellow boxed cake mix
1 tsp baking soda
1 1/2 cup butter (3 sticks), softened
2 eggs
2 egg yolks
4 tsp vanilla
1 cup sugar
1 cup brown sugar
1 1/4 cups semi-sweet chocolate chips
1 1/4 cups white chocolate chips
1 cup multi-colored candy sprinkles
In a large bowl, sift together flour, cake mix, and baking soda. Set aside. In a separate bowl, cream together the butter and sugars on medium speed. Mix in the egg, egg yolk, and vanilla until creamy. Add the flour mixture to the wet ingredients and mix until just combined. Do not over-mix the dough. Fold in the chocolate chips and sprinkles. Refrigerate dough for at least 1 hour. The dough is fairly sticky, so chilling the dough is mandatory in order to avoid the cookie from spreading too much.
Preheat oven to 350 degrees. Scoop rounded tablespoons of the cold dough onto an
ungreased baking sheet. Make sure to keep dough chilled when working in
batches. Bake for 11-14 minutes until edges are just slightly browned. The centers will still appear soft, but the
cookies will set as they cool. Allow the cookies to cool on the baking sheet for 4 minutes
and transfer to a wire rack to cool completely. Makes about 6 dozen.
adapted from sallysbakingaddiction.com
