Preheat the oven to about 325 F. Butter your cooking pan (the smaller the pan the thicker the layers - it is up to you what size you want to use).

In a bowl, mix the Oreo crumbs and melted butter together. Press the mixture into the bottom of the prepared pan. Bake in preheated oven for 6-7 minutes. Take out of oven and set aside. (Leave the oven on.)

While the crust is cooling off, prep the cheesecake layer. Use a mixer to cream the cream cheese and sugar together until smooth. Mix in the egg and vanilla. Mix in the crushed Oreos. Pour the Oreo cheesecake batter onto the Oreo crust.

Now to prep the cookie dough layer! Use your hands to form cookie dough balls, then flatten the balls using your palms. Try to distribute the flattened cookie dough evenly on top of the cheesecake batter. It doesn't have to be perfect!

Bake for about 30-35 minutes or until the cookie dough top feels dry and firm and the pan is set. You can shake the pan to see if it is too wobbly or if it has firmed up a bit. (This part is a bit tricky, so just do your best.)

I like to let anything with cheesecake sit overnight in the fridge before serving, but you can serve the bars after you let them cool for a few minutes if desired.