Using a standing mixer, whip the cream cheese, cornstarch, and granulated sugar until smooth and creamy.
Add the cream and vanilla. Add a few drops of blue food gel and mix.
Mix on medium speed until the ingredients have combined and the mix is smooth. Continue to add more blue coloring until you have the blue Cookie Monster color.
Add the eggs, one at a time. Mix on low speed until fully incorporated.
Add the crushed Oreos. Gently stir to mix all ingredients.
Pour the cheesecake batter over the cooled blondie layer.
Place the baking tray in the oven and bake for 60 to 70 minutes.
The cheesecake will be set but a little jiggly in the middle.
Turn off the oven, don't remove the cheesecake.
Let the cheesecake cool for 15 to 30 minutes inside the oven with the oven door ajar.
Allow the cheesecake to cool to room temperature completely.
Carefully loosen the cheesecake from the springform pan.
Run a thin butter knife along the edge of the pan to loosen the cake if it is sticking to the sides of the pan.
Cover the cake.
Refrigerate for at least 8 hours.