Preheat the oven to 350 degrees F. Spray an 8-inch spring form pan or an 8-inch deep-dish pie pan with nonstick spray. Set aside.
In a medium-size mixing bowl, mix together the cookie dough and the peanut butter until the peanut butter is fully incorporated. Stir in the oats.
Press the dough into the springform pan or pie dish, making sure to push some of the dough up the sides of the pan. Alternately, you can roll the dough into a 10-inch circle and lay it into the pan. To do so, roll it out on parchment or a floured surface.
To ensure the cookie crust holds its shape, cover the cookie crust with parchment paper and place a 6-inch cake pan on top. Refer to my video HERE on Instagram to see a tutorial.
Bake (with the pan on the crust) for 25 minutes.
Allow to cool completely before removing the pan and parchment.