In a bowl, combine graham cracker crumbs, sugar, and melted butter. Mix until well combined. Press the mixture firmly into the bottom of a 9x9 inch baking pan to form an even layer.
In a separate bowl, beat the softened cream cheese with the granulated sugar and vanilla extract until smooth and creamy. Gently fold in the whipped topping until fully combined. Spread this mixture over the graham cracker crust evenly.
In another bowl, cream together the softened butter, brown sugar, granulated sugar, and vanilla extract until light and fluffy. Gradually mix in the heat-treated flour and salt until combined. Fold in the mini chocolate chips.
Drop spoonfuls of the cookie dough mixture over the cheesecake layer, spreading it out as best as possible with a spatula. Aim for an even layer, but it's okay if some cheesecake is visible.
Cover the pan with plastic wrap and refrigerate for at least 2 hours or until firm.
Once chilled and set, cut into 12 bars. Serve cold and enjoy!