Once the chocolate is set, remove the pan from the fridge. If you used parchment, lift the entire slab out of the glass dish and place it on a cutting board. Using a sharp knife, cut into 16 squares (or smaller bite-size pieces if serving a crowd). Wipe the knife between cuts for cleaner edges and a tidy, overhead-photo-ready look.
Serve the bars straight from the glass casserole dish on the counter or transfer them to a platter. Store any leftovers covered in the refrigerator for up to 5 days. For the best texture, let them sit out for 5–10 minutes before serving so the base softens just a bit while the chocolate top stays firm.
Variations & Tips
For a slightly sweeter base, you can add 1–2 tablespoons of powdered sugar to the graham cracker and peanut butter mixture before pressing it into the dish, though this keeps it to three main ingredients. If you like a stronger peanut flavor, bump the peanut butter up to 1 1/4 cups and add graham crumbs a spoonful at a time until the mixture holds together. For kids who don’t love dark chocolate, swap some or all of the semisweet chips for milk chocolate chips. If you prefer a less sweet, more grown-up version, use bittersweet chocolate chips.
You can also sprinkle a small pinch of flaky sea salt over the melted chocolate before chilling to balance the sweetness and give a bakery-style finish. For peanut allergies, this exact recipe won’t work safely, but you can adapt the idea by using sunflower seed butter or another nut/seed butter that the family tolerates, keeping in mind that textures can vary and you may need to adjust the graham crumbs slightly.
Food safety tips: Make sure your hands, utensils, and the glass dish are clean and dry before starting. When melting chocolate in the microwave, stir frequently and avoid overheating to prevent scorching. Because these bars are rich and contain peanut butter, keep them covered and refrigerated if your kitchen is warm, especially during summer parties. If you’re taking them to a neighborhood gathering, transport them in an insulated bag or cooler if it’s hot out, and don’t leave them sitting in direct sun so the chocolate layer stays set and safe to enjoy.
