These bars are the kind of dessert I make when I want something comforting, quick to slice, and reliably crowd-pleasing. They have a soft, chewy base studded with mini dark chocolate chips and a surprising burst of peanut butter from Nestle DelightFulls tucked right into each bite. No rolling balls, no scooping dozens of cookies — just press, bake, cool, and cut.

They come together in a single jelly roll pan, so clean-up is minimal and the yield is generous. I love them for casual weeknight dessert runs, for packing in lunches, or for when friends drop by and you realize you need something impressive in under an hour. The texture is approachable: slightly crisp at the edges and tender in the center.

Below you’ll find everything you need: a clear ingredient list, exact step-by-step instructions, tools, troubleshooting tips, and smart make-ahead strategies. Follow the procedure as written and you’ll end up with even bars that slice neatly and hold well at room temperature.

The Essentials

Temperature and timing: preheat to 375°F and bake the cookie sheet for about 25 minutes. A 15×10-inch jelly roll pan gives you thin, even bars that brown on the edges while staying moist in the middle. Let the pan cool completely before cutting; that finishing rest is what keeps them from crumbling.

Technique in two sentences: cream the butter and dark brown sugar until light, fold in the dry ingredients gently, then press the dough into the pan. The peanut butter DelightFulls and mini dark chocolate chips get folded in at the end so they stay intact and distributed throughout the slab.

Ingredients

1-1/4 cup all purpose flour — provides structure; use spoon-and-level measuring for accuracy.
1 cup white whole wheat flour — adds a touch of nuttiness and chew; keep it packed lightly.
1 teaspoon baking soda — leavens and helps the bars spread just enough.
1 teaspoon kosher salt — balances sweetness; if using table salt, reduce slightly.
1 cup unsalted butter, room temperature — creamed with the brown sugar for tenderness and flavor. Room temperature means soft but not melted.
1-1/2 cups dark brown sugar — brings moisture and a caramel-like depth; pack lightly when measuring.
1 teaspoon vanilla bean paste — concentrated vanilla flavor; extract is fine if that’s what you have.
2 large eggs — bind and enrich the dough; add them one at a time as directed.
1 package peanut butter Nestle DelightFulls — the stuffed peanut butter pieces that give the bars their peanut-buttery surprise.
1 cup mini dark chocolate chips — dark chips provide contrast and pockets of melty chocolate without overpowering the peanut butter.

Build Peanut Butter Stuffed Chocolate Chip Cookie Bars Step by Step

Preheat the oven to 375°F and place a rack in the center. Spray a 15×10-inch jelly roll pan with non-stick spray.
In a medium bowl, whisk together the all-purpose flour, white whole wheat flour, baking soda, and kosher salt. Set the flour mixture aside.
In the bowl of an electric mixer, add the room-temperature unsalted butter and dark brown sugar. Beat on medium-high for about 2 minutes, until the mixture is light and fluffy.
Add the vanilla bean paste and mix until incorporated.
Add the eggs one at a time, mixing and scraping down the bowl as needed so each egg is fully incorporated before adding the next.
Reduce the mixer speed to low and gradually add the flour mixture, mixing just until the dough is combined and no dry streaks remain. Scrape down the sides and bottom of the bowl as needed.
Fold in the peanut butter Nestle DelightFulls and the mini dark chocolate chips with a spatula until evenly distributed.
Transfer the dough to the prepared jelly roll pan and press it into an even layer using an offset spatula or the back of a spoon.
Bake on the center rack for about 25 minutes, or until the edges and top are lightly browned and a toothpick inserted near the center comes out with a few moist crumbs.
Remove the pan from the oven and let the cookie bars cool completely in the pan on a wire rack.
Once cooled, cut into bars and serve.

Why It’s My Go-To

These bars are forgiving. The dough presses easily into the pan, and even if your edges brown a hair more than you planned, the center stays tender. They also travel well — no fragile cookie domes to worry about. I keep a jar of these in my fridge when I know a snack emergency is imminent.

Also, the contrast between the mini dark chocolate chips and the peanut butter centers is irresistible. The peanut butter pockets are a built-in surprise that make each bar feel deliberate and a little decadent without extra effort.

International Equivalents

If you’re baking outside the U.S. and want to match textures or flavors: look for equivalent pan sizes (a 13×9-inch pan will yield slightly thicker bars; adjust bake time) and check your local versions of mini dark chocolate chips. White whole wheat flour can sometimes be swapped with regular whole wheat flour, but expect a bit more density.

For the peanut butter bites, if Nestle DelightFulls aren’t available, seek out small filled peanut butter candies or chopped peanut butter cups. Keep them in bite-size pieces so distribution remains even. Dark brown sugar may be labeled as “soft brown” or “dark muscovado” in some regions; use whatever gives that molasses-rich flavor.

Prep & Cook Tools

15×10-inch jelly roll pan — the correct size gives the right thickness and bake time.
Electric mixer (stand or hand) — for creaming butter and sugar smoothly.
Mixing bowls — at least one medium bowl to whisk dry ingredients.
Offset spatula or the back of a spoon — for pressing the dough evenly.
Wire rack — to cool the pan completely before cutting.
Measuring cups and spoons — accurate measuring keeps texture consistent.
Toothpick — for checking doneness in the center.

Avoid These Traps

Overbaking — bars will continue to set as they cool. Remove them when the top is lightly browned and a toothpick has a few moist crumbs.
Pressing too hard — if you press the dough unevenly, bars can bake with thin and thick patches. Aim for a uniformly leveled surface.
Using cold butter — it won’t cream properly, which affects texture. Use room-temperature butter that yields to gentle pressure.
Cutting too soon — warm bars crumble. Cooling completely in the pan yields clean edges.

Substitutions by Diet

Gluten-free: swap both flours for a gluten-free all-purpose 1:1 blend and follow package guidance for binding. Expect a slightly different crumb; chill the dough briefly if it feels too soft.

Dairy-free: replace the unsalted butter with a firm, block-style plant-based butter that behaves similarly when creamed. Use the same method — cream with the dark brown sugar until light — and proceed as written.

Egg-free / Vegan: use an egg replacer suitable for baking or a flax “egg” (ground flaxseed mixed with water). Because eggs add structure and moisture, choose a replacer you trust for bar-style cookies and watch the texture; you may need a brief chill before pressing into the pan.

Lower-sugar: reducing the brown sugar will alter moisture and spread. If you must cut sugar, consider combining a smaller reduction with an extra egg white or a brief chill to maintain structure.

Notes on Ingredients

Each ingredient in this recipe has a clear job. The two flours balance tenderness and chew. The dark brown sugar adds both sweetness and moisture thanks to its molasses content. Kosher salt elevates flavor rather than making the bars salty. Vanilla bean paste gives a more intense, speckled vanilla note than plain extract. The peanut butter Nestle DelightFulls are the unique element here; they deliver concentrated pockets of peanut butter without needing to spoon or pipe filling into the dough. Mini dark chocolate chips distribute more evenly than full-size chips and provide small, satisfying hits of chocolate.

Make Ahead Like a Pro

These bars keep well. Once cooled and cut, store them in an airtight container at room temperature for up to 3 days. If you need longer, freeze an airtight layer separated by parchment for up to 2 months. Thaw at room temperature before serving; they regain their tender texture quickly.

If you want to prep in stages: make the dough up to the point of folding in the peanut butter DelightFulls and chips, refrigerate for up to 24 hours, then fold in the mix-ins, press into the pan, and bake when ready. Chilled dough can be easier to handle and may yield slightly thicker bars.

Your Top Questions

Can I use regular peanut butter instead of Nestle DelightFulls? — Regular peanut butter will change texture and distribution. The DelightFulls are solid pieces that stay intact; using spreadable peanut butter would require a different technique and could affect bake time.
Why both all-purpose and white whole wheat flour? — The combination keeps the bars tender while adding a touch of whole-grain flavor and chew. You can experiment with only all-purpose, but expect a slightly different mouthfeel.
Do I have to use mini chips? — Mini chips work best for even distribution. If you only have regular chips, chop them small so they disperse like mini chips.
How large should the bars be? — Cut to your preference. For party-size servings, slice into 24 squares; for heartier portions, cut fewer, larger bars. Let them cool fully before slicing.

In Closing

These Peanut Butter Stuffed Chocolate Chip Cookie Bars are one of those recipes that feel special without being fussy. They come together quickly, hold up well, and offer a little surprise in every bite thanks to the peanut butter centers. Follow the steps as written, mind the cooling time, and you’ll have a slab of portable, crowd-pleasing dessert that disappears fast.

Make them for potlucks, pack them for lunchboxes, or keep a pan on hand for emergencies; they’re versatile, dependable, and easy to personalize once you get comfortable with the base technique. Happy baking.

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Peanut Butter Stuffed Chocolate Chip Cookie Bars

There’s something undeniably comforting about the combination of peanut butter…

Prep Time10

Cook Time43

Total Time1 23

Course: Dessert

Servings: 4 servings

Ingredients

1-1/4 cup all purpose flour1 cup white whole wheat flour1 teaspoon baking soda1 teaspoon kosher salt1 cup unsalted butter room temperature1-1/2 cups dark brown sugar1 teaspoon vanilla bean paste2 large eggs1 package peanut butter Nestle DelightFulls1 cup mini dark chocolate chips

Instructions

Preheat the oven to 375°F and place a rack in the center. Spray a 15x10-inch jelly roll pan with non-stick spray.
In a medium bowl, whisk together the all-purpose flour, white whole wheat flour, baking soda, and kosher salt. Set the flour mixture aside.
In the bowl of an electric mixer, add the room-temperature unsalted butter and dark brown sugar. Beat on medium-high for about 2 minutes, until the mixture is light and fluffy.
Add the vanilla bean paste and mix until incorporated.
Add the eggs one at a time, mixing and scraping down the bowl as needed so each egg is fully incorporated before adding the next.
Reduce the mixer speed to low and gradually add the flour mixture, mixing just until the dough is combined and no dry streaks remain. Scrape down the sides and bottom of the bowl as needed.
Fold in the peanut butter Nestle DelightFulls and the mini dark chocolate chips with a spatula until evenly distributed.
Transfer the dough to the prepared jelly roll pan and press it into an even layer using an offset spatula or the back of a spoon.
Bake on the center rack for about 25 minutes, or until the edges and top are lightly browned and a toothpick inserted near the center comes out with a few moist crumbs.
Remove the pan from the oven and let the cookie bars cool completely in the pan on a wire rack.
Once cooled, cut into bars and serve.