Peanut Butter Bars

My sister walked into the kitchen one July afternoon and announced she was bringing dessert to a potluck in exactly three hours, then stared at me blankly waiting for a miracle.

I handed her a spatula, pulled out a mixing bowl, and had these bars chilling in the fridge before she finished telling me about the coworker who always brings store bought cookies to every gathering.

Ingredients

• 1 cup creamy peanut butter: Use the regular kind, not natural or stirred, because the oils in natural peanut butter change the texture and the bars wont set firmly.
• 1/2 cup unsalted butter, melted: Melt it just until liquid, not browned, since you want richness without adding a toasted flavor that competes with the peanut butter.
• 2 cups graham cracker crumbs: You can pulse whole crackers in a food processor or buy pre crushed, but the crumbs must be fine for a smooth, even base.
• 2 cups powdered sugar: This sweetens and firms up the base simultaneously, so dont swap in granulated sugar or the texture will be gritty.
• 1 1/2 cups semi sweet chocolate chips: Semi sweet strikes the right balance against the sweet peanut butter layer, though milk chocolate works if you prefer a sweeter bar.
• 1/4 cup creamy peanut butter for the topping: This small addition keeps the chocolate layer soft enough to cut cleanly rather than cracking into shards.

Instructions

Line the pan:

Tear a sheet of parchment paper long enough to overhang the sides of your 9 by 13 inch dish, which makes lifting the whole slab out later feel satisfyingly easy.

Mix the base:

Stir the peanut butter and melted butter together until completely smooth, then dump in the graham crumbs and powdered sugar all at once.

Work the mixture with a spatula until every dry pocket disappears and you have a uniform, thick dough.

Press it in:

Transfer the mixture to your lined dish and press it down firmly with your hands or the back of a spoon, making sure the surface is as flat and even as you can get it.

Melt the topping:

Combine the chocolate chips and remaining peanut butter in a microwave safe bowl and heat in 30 second bursts, stirring between each one, until the mixture is glossy and lump free.

Spread and chill:

Pour the chocolate over the base and use a spatula to coax it all the way to the edges, then slide the dish into the fridge for at least two hours.

Wait until the top is completely firm to the touch before slicing.

Cut and serve:

Lift the slab out using the parchment overhang, set it on a cutting board, and slice into 16 even squares with a sharp knife.

Pin It

My sister carried that dish into the potluck and came home with an empty pan and a text from her coworker asking, quite seriously, if I would consider selling them by the dozen.

What to Know About Storing Them

These bars keep beautifully in the fridge for up to a week, though in my experience they vanish well before that deadline.

Making Them Your Own

Fold a half cup of chopped roasted peanuts into the base if you want crunch, or swap the graham crackers for digestive biscuits when you want a slightly more biscuity depth.

• A wet knife cuts cleaner squares than a dry one.
• Freeze individual bars between layers of wax paper for up to three months.
• Always check chocolate chip labels if allergies are a concern, since cross contamination with soy or nuts is common.

These bars contain peanuts, dairy, wheat, and possibly soy, so read every label carefully if you are serving someone with sensitivities.

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Keep a plate of these in your fridge during the holidays and you will never scramble when unexpected guests appear at the door.

Recipe Questions

→ Can I make the base firmer or softer?

Adjust the powdered sugar and graham crumb ratio: more powdered sugar firms the base, while slightly more peanut butter yields a softer, chewier texture. Press firmly into the pan for a compact foundation.

→ What's the best way to melt the chocolate topping?

Warm chocolate chips and peanut butter in 30-second microwave intervals, stirring between each until smooth. Alternatively, use a double boiler over low heat to avoid scorching and keep the mixture glossy.

→ How do I add crunch without changing texture?

Fold in 1/2 cup chopped roasted peanuts into the base mixture before pressing it into the pan. This preserves the chewy interior while introducing a crunchy contrast in every bite.

→ Can I substitute the graham crackers?

Yes—digestive biscuits or finely crushed shortbread work well. Choose a slightly drier crumb if you want a firmer base, and adjust the peanut butter slightly to achieve the desired consistency.

→ How long do the bars keep and how should I store them?

Store the bars in the refrigerator for up to one week in an airtight container. For longer storage, freeze for up to three months; thaw in the fridge before serving to maintain texture.

→ Any tips for cleanly slicing the bars?

Lift the chilled block from the pan using the parchment paper, chill until very firm, then use a sharp knife warmed under hot water and dried between cuts for smooth, tidy slices.