Preparation Steps

• Preheat oven to 325°F. Line a 9-inch springform pan with parchment paper and grease the sides.
• In a bowl, combine vanilla wafer crumbs, melted butter, and 3 tablespoons sugar. Press into pan bottom and sides evenly.
• Bake crust for 10 minutes. Remove and let cool. Wrap outside of pan with foil for water bath.
• Reduce oven temperature to 300°F. In a large bowl, beat cream cheese, sugar, and 3 tablespoons flour until smooth using low speed. Scrape down sides.
• Mix in sour cream and vanilla extract on low speed until combined.
• Add eggs one at a time, mixing slowly after each addition. Scrape bowl sides as needed.
• Stir in 5 tablespoons of sprinkles gently. Set cheesecake filling aside.
• In a separate bowl, combine 16 oz rainbow chip frosting with remaining 6 tablespoons flour. Mix well.
• Spread frosting evenly over the cooled crust bottom.
• Layer half the mini vanilla wafers over the frosting.
• Spread half of the cheesecake filling evenly over the wafers.
• Add remaining mini vanilla wafers on top in an even layer.
• Spoon remaining cheesecake filling over the wafers and smooth the surface.
• Place springform pan into a larger pan and add warm water halfway up pan sides for water bath. Do not let water reach foil top.
• Bake cheesecake for 1 hour 10 minutes until center is set but still slightly jiggly.
• Turn off oven and keep door closed for 30 minutes to let cheesecake gently cook and cool.
• Crack oven door open and cool cheesecake for additional 30 minutes to prevent cracks.
• Remove cheesecake from oven and water bath. Refrigerate for 5-6 hours or overnight until firm.
• Remove cheesecake from springform pan and place onto serving dish.
• For blue buttercream, beat 0.5 cup butter until smooth. Gradually add half powdered sugar and mix well.
• Add 0.5 tsp vanilla extract and 1 tablespoon cream or water, mixing until combined.
• Add remaining powdered sugar, mix to smooth consistency, adding more cream or water if needed.
• Add blue gel icing color to buttercream and mix until evenly colored.
• Spread part of the second can of rainbow chip frosting on cheesecake top, leaving space around edges.
• Pipe blue buttercream around outer edge of cheesecake for decoration.
• Decorate top with additional sprinkles and pieces of Dunkaroo cookies.