Top the bars: Pour the warm chocolate-peanut butter mixture over the pressed crust. Tilt the pan or use an offset spatula to spread the topping into an even layer, making sure it reaches all the corners.
Chocolate topping being spread over the crust
Chocolate topping being spread over the crust
Chill to set: Refrigerate the pan for at least 1–2 hours, or until the chocolate topping is fully set and firm to the touch. For the cleanest slices, let the bars chill a bit longer so the layers are well stabilized.
Slice and serve: Use the parchment overhang to lift the slab out of the pan and transfer to a cutting board. Let it sit at room temperature for 5–10 minutes to soften slightly, then cut into 16 small squares (or larger pieces, if you prefer). Store leftovers covered in the refrigerator for up to 5 days, or freeze for longer storage.
Variations & Tips
Because this recipe is so simple, it’s an easy canvas for small tweaks that change the character of the bars.
For added texture, stir a handful of finely chopped roasted peanuts into the base before pressing it into the pan, or sprinkle them over the chocolate layer before chilling. If you prefer a slightly less sweet dessert, use bittersweet chocolate (60–70% cacao) instead of semisweet, and add a pinch of fine salt to the crust mixture to sharpen the flavors.
Finished bars topped with chopped peanuts and flaky salt
Finished bars topped with chopped peanuts and flaky salt
Crunchy peanut butter can be used in place of creamy for more texture; just be sure it’s well-stirred so the oil is evenly distributed. To make them gluten-free, swap the graham crackers for certified gluten-free graham-style crumbs or finely crushed gluten-free cookies.
For a flavor twist, add 1/2 teaspoon of vanilla extract to the crust, or a light sprinkle of flaky sea salt on top of the chocolate before it sets—a small touch that gives the bars a more grown-up, bakery-style finish. If your kitchen runs warm, keep the bars chilled until close to serving time so the layers stay firm and distinct.
