Preheat the oven to 350ºF and grease an 8x8" baking dish with cooking spray.
In a blender or food processor, combine; avocado, banana, agave syrup, and vanilla. Blend until just combined. Fold into melted chocolate.
In a large bowl, combine; eggs or aquafaba eggs, coconut flour, cocoa powder, sea salt, baking soda, and avocado mixture. Whisk ingredients to combine.
Using a hand mixer, blend all ingredients together until well combined. Do not overmix.
Pour the mixture into the greased baking tray and add more chocolate chips to the batter if desire. Top your batter with the Oreo cookies before baking.
Bake for about 25 minutes or until set through. Allow cooling completely before cutting. Cut into 9 squares and enjoy.