– 3/4 c. butter, room temperature – 1/2 c. granulated sugar – 1/2 c. light brown sugar – 1 egg – 1 tsp. vanilla – 1 c. all purpose flour – 1 1/2 c. funfetti boxed cake mix, dry/unprepared – 1 tsp. salt – 1/2 tsp. baking soda – 1/2 c. white chocolate chips – 1/2 c. semi-sweet chocolate chips – 1/3 c. rainbow spirnkles, like jimmies