Line an 8x8 pan with tin foil. Spray with cooking spray.
In a double boiler, melt the white chocolate chips. It will take a few minutes. You can also microwave the white chocolate chips in a microwave-safe bowl for 30 second intervals and stirring after each time in the microwave until the chips are smooth.
Add the red frosting into the white chocolate chips and stir until thoroughly incorporated.
Pour the fudge into the prepared pan and spread evenly out.
Add a drizzle of blue cookie to the top of the fudge, working quickly.
Using a toothpick or skewer, run it through the blue and red to swirl it together. Tap the dish out to help smooth out the fudge.
Add sprinkles to the top of the fudge.
Chill the fudge until it's completely firm. Cut into small squares.