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These Biscoff chocolate chip cookie bars are the perfect one pan dessert every family needs. A thick oatmeal cookie base meets semisweet chocolate and warm Biscoff spread. Every square bakes up soft in the middle with gooey cookie butter and crisp speculoos crumbs on top.
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What makes this dish special
When I worked as a private chef cooking for families, dessert was the course that won the kids over every single time. The recipes with the best reactions were almost always the simplest ones, like these pistachio butter dark chocolate chunk cookies, triple berry chocolate cobbler, and passion fruit caramel cookie bars. I learned quickly that a pan of cookie bars beats a fussy plated dessert almost every single time. That memory is where these Biscoff chocolate chip cookie bars come from. I wanted the low effort of an oatmeal chocolate chip cookie, but with a twist.
The answer is Biscoff. I will admit that I keep a jar of cookie butter in my pantry that I eat by the spoon when no one is watching. So, swirling it into a cookie bar felt less like a recipe idea and more like an inevitability. These bars bring together a chewy oatmeal cookie base, melty pockets of semisweet chocolate, swirls of warm cookie butter, and a crackle of crushed Biscoff cookies on top. Because what is better than a dessert you can make in one bowl and still feel proud of, right?
Recipe
Biscoff Chocolate Chip Cookie Bars
Ingredients
- 1 cup butter, melted and cooled slightly (227 grams)
- 1 cup packed brown sugar (200 grams)
- ½ cup granulated sugar (100 grams)
- 2 large eggs
- 1 large egg yolk
- 2 teaspoons vanilla extract
- 2 cups all purpose flour (250 grams)
- 1 ½ cups old fashioned rolled oats (120 grams)
- 1 teaspoon baking soda
- ½ teaspoon baking powder
- ¾ teaspoon salt
- ½ teaspoon ground cinnamon
- 1 cup semisweet chocolate chips (170 grams)
- ¾ cup creamy Biscoff cookie butter, warmed until pourable (180 grams)
- 6 Biscoff cookies roughly crushed
Instructions
- Preheat the oven to 350°F. Line a 9x13 inch pan with parchment paper, leaving an overhang on two sides.
- Whisk melted butter with brown sugar and granulated sugar until smooth. Whisk in the eggs, egg yolk, and vanilla.
- Stir in the flour, oats, baking soda, baking powder, salt, and cinnamon until just combined. Fold in chocolate chips.
- Press about two thirds of the dough into the pan in an even layer. Spoon the warmed Biscoff over the dough. Drop the remaining dough on top in spoonfuls, and gently spread it on top of the Biscoff. Scatter the crushed Biscoff cookies over the top.
- Bake for 28-32 minutes, until the edges are set and golden and the center looks slightly underdone. Cool completely in the pan, at least 1 hour, before lifting out and cutting into 24 bars.
Notes
Step-by-step instructions
Step 1: Make the cookie batter
Start by lining a 9-by-13-inch baking pan with parchment paper, leaving an overhang on two sides. That little flap of paper becomes a handle later and makes it infinitely easier to remove the baked bars.
Now, melt the butter and let it cool for a minute. We're using melted butter because it gives you a dense, chewy bar instead of a cakey one, which is what we're looking for in these dessert bars.
Whisk the melted butter with the brown sugar and granulated sugar until the mixture turns smooth and glossy. Then, whisk in the eggs, the extra yolk, and the vanilla. That extra yolk is my little secret for a fudgy center, so do not skip it.
Add the flour, oats, baking soda, baking powder, salt, and cinnamon, stirring just until combined. Be careful not to overmix because overmixing builds gluten and gives you tough bars.
Recipe tip
Reach for old-fashioned rolled oats, not quick oats or instant oats. The big rolled flakes hold their shape through baking and give you the hearty, chewy texture. Quick oats turn soft and almost vanish into the dough, and instant oats can go gummy. If quick oats are all you have, they will work in a pinch, but expect a softer, less chewy bar.
Finally, fold in the chocolate chips. The batter will be thick, closer to a cookie dough than a cake batter, and yes, it is very hard to resist a spoonful at this point.
Step 2: Layer the cookie bars
Press about two-thirds of the dough into the bottom of your lined pan in an even layer. The dough is sticky, so press it down with damp fingertips or the back of a spoon to keep it from grabbing at your hands.
Next, warm the Biscoff spread until it pours easily, just a few seconds in the microwave. You want it loose like warm honey, not hot and runny. If it gets too thin, it sinks straight into the dough.
Spoon the warm Biscoff over the dough, then drop the rest of the dough on top in spoonfuls, spacing them out so the Biscoff still peeks through.
Use a small offset spatula to spread the dough carefully on top of the Biscoff. You can also drag a knife back and forth through the pan to pull everything into swirls. There is no wrong way to do this, so let yourself have a little fun with it.
Finish by scattering the crushed Biscoff cookies over the top for crunch.
Step 3: Bake
Slide the pan into the oven and bake for about 30 minutes. You are looking for edges that are set and golden, while the center still looks a touch underdone and soft.
Pull the pan right then, even if it makes you a little nervous. The bars will keep cooking in the hot pan as they cool. Now comes the hardest part, which is waiting.
Let the Biscoff chocolate chip cookie bars cool completely in the pan, at least an hour, before you lift them out by the parchment handle. Warm bars tear and crumble when you cut them, while fully cooled bars slice into clean squares.
Once they are set, cut them into 24 bars and watch them disappear.
I took a bite of these dessert bars and immediately grabbed a second piece. This is my ideal dessert, combining an oatmeal chocolate chip cookie with swirls of cookie butter and crushed cookies on top. Yes, it's indulgent, but it's just the right amount of richness. Enjoy these with a glass of milk, and I promise you, both kids and adults will be happy!
Make-ahead and storage tips
- Make-ahead: Press the dough into the pan, cover, and refrigerate up to 24 hours before baking. Add 2 to 3 minutes to the bake time if you bake it cold.
- Store: Keep the bars in an airtight container at room temperature for up to 4 days or in the refrigerator for up to 1 week.
More family-friendly dessert recipes
Looking for more desserts for the whole family? Try these:
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All images shot and styled by Christine Ma. Available for food photography, styling, and recipe development.
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