Step 1: Prep your pan: Line a 9x13-inch baking dish with parchment paper, leaving some overhang on the sides.
Step 2: Mix the base: In a large mixing bowl, combine graham cracker crumbs, powdered sugar, melted butter, and the first cup of creamy peanut butter.
Step 3: Combine: Stir until everything is just combined and the mixture is uniform and moist.
Step 4: Press it down: Pour the mixture into the prepared dish and use a spatula, the bottom of a glass, or your hands to press it down firmly and evenly into a compact, flat layer.
Step 5: Make the topping: In a medium-sized microwave-safe bowl, add your semisweet chocolate chips and the remaining ½ cup of creamy peanut butter.
Step 6: Melt the chocolate: Microwave the bowl in 30-second bursts, stirring well after each interval, until the mixture is completely melted, smooth, and glossy.
Step 7: Pour it on: Carefully pour the warm, melted chocolate-peanut butter mixture over the pressed graham cracker base in the dish.
Step 8: Spread evenly: Use a spatula or the back of a spoon to gently spread the melted topping all the way to the edges, covering the base completely.
Step 9: Chill out: Pop the dish into the refrigerator for at least 2 hours to allow the bars to firm up.
Step 10: Let it soften slightly: Before cutting, take the dish out of the fridge and let it sit at room temperature for about 5 minutes.
Step 11: Slice and serve: Use the parchment paper overhang to lift the slab out. Use a sharp knife (run under hot water and wipe dry for clean cuts) to slice into squares or bars. Enjoy!