Line a 9x13-inch baking pan with foil and spray with baking spray. Set aside.

PEANUT BUTTER LAYER: In the bowl of a stand mixer, affixed with the paddle attachment (or in a large bowl, stirring by hand), add the peanut butter and melted butter. Mix until ingredients are combined. Next, add the vanilla extract and powdered sugar into the butter mixture, adding the powdered sugar cup by cup. Make sure each cup of powdered sugar is incorporated into the butter mixture before you add the next cup of powdered sugar. After the sugar is incorporated into the butter mixture, add the fine graham cracker crumbs and mix until all ingredients are combined.

Pour the mixture into the prepared 9x13-inch pan and press out into an even layer. Prepare chocolate topping.

CHOCOLATE TOPPING: In a microwave safe bowl, add the three cups semi-sweet chocolate chips and one tablespoon peanut butter. Microwave in 10-second intervals, stirring in between. Be careful not to scorch your chocolate or over cook it. And whatever you do DO NOT WALK AWAY FROM THE CHOCOLATE MELTING IN THE MICROWAVE! It only takes me 1 to 1-1/2 minutes to melt the chocolate. Once melted, spread the chocolate evenly, covering the entire peanut butter layer.

Let bars set on the counter for 1-hour before transferring to the refrigerator to cool completely. Once the bars have cooled, allow the bars to sit at room temperature for 20-30 minutes before cutting, to ensure easy cutting.