In a large bowl, mix together cake mix, puree, eggs, and butter until smooth. Spread in a greased 9x13" glass dish.
Add Kool-Aid mix into vanilla frosting; mix well. Spoon 6-8 large dollops of frosting over cake mixture.
Add white chocolate chips and sprinkles.
Gently swirl entire contents of glass dish together. Do not completely mix; you should see swirls of each ingredient.
Bake at 350° for 40-45 minutes, or until center of cake is no longer jiggly. Let cool for 10-15 minutes; serve warm.