Biscoff Blondies

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Thick, chewy, and absolutely packed with warm cookie butter flavor, these Biscoff Blondies are what happens when your favorite spread becomes your new favorite dessert bar. Each bite is dense and fudgy like a blondie should be, with melty pockets of Biscoff spread and soft crumbs that practically melt on your tongue.

They’re the kind of dessert you bring to a party and then quietly watch disappear from the pan. Simple pantry ingredients, a quick stir-together batter, and no mixer required—just rich brown sugar, melted butter, and plenty of Biscoff to keep things gloriously gooey.

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Why You’ll Love These Biscoff Blondies

These blondies are the definition of low effort, high reward. The batter is mixed in one bowl, poured into a pan, and baked into thick golden squares with a crackly top and ultra-soft center. No chilling, no complicated steps—just mix, swirl, and bake.

They also store beautifully, making them perfect for make-ahead desserts, bake sales, school treats, or anytime you need something sweet that travels well. The Biscoff flavor is cozy, caramelized, and slightly spiced, so they feel special enough for holidays while still being easy enough for a random Tuesday.

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What Makes These Biscoff Blondies So Gooey and Flavorful?

The secret to their texture is a combination of melted butter, brown sugar, and a generous amount of Biscoff spread. Melted butter keeps the crumb dense and fudgy instead of cakey, while brown sugar adds moisture, softness, and a deep butterscotch note that pairs perfectly with the cookie butter.

We also swirl extra Biscoff spread on top and fold in chunks of Biscoff cookies. As the blondies bake, the spread creates ribbons of molten cookie butter, and the cookies soften slightly, giving you pockets of crunch and chew in every square.

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Ingredients for the Biscoff Blondies

Before we get into measurements, let’s talk through the ingredients and why each one matters. This helps you know where you can tweak and where you really shouldn’t.

• Unsalted butter
• Light brown sugar
• Granulated sugar
• Biscoff spread (cookie butter)
• Large eggs
• Vanilla extract
• All-purpose flour
• Baking powder
• Fine sea salt
• Biscoff cookies

Each of these plays a specific role: the butter and brown sugar create moisture and chew, the cookie butter delivers that signature spiced caramel flavor, eggs bind everything together, and flour plus a touch of baking powder give the bars enough structure to slice cleanly without turning cakey. Crushed Biscoff cookies add texture and intensify the flavor throughout.

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How To Make the Biscoff Blondies

Once your ingredients are ready, the rest is just a matter of layering flavor and not overmixing. These blondies come together quickly, so go ahead and line your pan before you start.

Step 1: Prep the Pan and Oven

Line a 9×9-inch baking pan with parchment paper, leaving an overhang on two sides so you can lift the blondies out later. Lightly grease the parchment and sides of the pan. Preheat your oven to 350°F (175°C) so it’s hot and ready when your batter is mixed.

Step 2: Melt the Butter and Cookie Butter

In a medium saucepan or microwave-safe bowl, gently melt the unsalted butter until just liquid. Whisk in part of the Biscoff spread while the butter is still warm so it melts into a smooth, glossy mixture. Let this cool slightly so it doesn’t scramble the eggs later.

Step 3: Build the Blondie Base

In a large mixing bowl, combine the brown sugar and granulated sugar. Pour in the melted butter–Biscoff mixture and whisk until the sugars look thick and shiny. Add the eggs one at a time, whisking well after each addition, then mix in the vanilla extract. The batter should be smooth and slightly thick at this stage.

Step 4: Add the Dry Ingredients

In a separate bowl, whisk together the all-purpose flour, baking powder, and fine sea salt. Gently fold the dry ingredients into the wet mixture using a spatula. Stop as soon as no streaks of flour remain—overmixing will make the blondies tough instead of soft and fudgy.

Step 5: Fold in Biscoff Cookie Chunks

Roughly chop the Biscoff cookies into bite-size pieces. Fold most of them into the batter so they’re evenly distributed, reserving a small handful to sprinkle on top. This adds crunch and reinforces the spiced cookie flavor in every bite.

Step 6: Swirl in Extra Biscoff Spread

Pour the batter into your prepared pan and smooth it into an even layer. Warm the remaining Biscoff spread just enough to make it pourable, then drizzle it over the top of the batter in ribbons. Use the tip of a knife or a skewer to gently swirl the spread into the surface without mixing it all the way in.

Step 7: Bake and Cool

Scatter the reserved Biscoff cookie pieces over the top, then bake for 25–30 minutes, or until the edges are set and turning golden and the center looks just barely set with a slight jiggle. A toothpick inserted into the center should come out with a few moist crumbs, not wet batter.

Let the blondies cool completely in the pan before lifting them out with the parchment and slicing into squares. This cooling time is what helps them set into thick, neat bars.

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How Many People Do These Biscoff Blondies Serve?

A 9×9-inch pan of blondies can be cut into 16 small squares for a party platter or into 9 generous pieces for a more indulgent dessert. For most gatherings, plan on the full pan serving about 8–12 people, depending on how big you slice them and what else you’re serving alongside.

These bars are rich, so even smaller squares feel satisfying—especially if you’re pairing them with coffee, ice cream, or a dessert spread with other treats.

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How to Store Your Biscoff Blondies

Because these blondies are so moist, proper storage keeps them soft and flavorful for days. Once completely cooled, place the sliced bars in an airtight container with parchment paper between layers to prevent sticking.

At room temperature, they’ll stay fresh for up to 3 days. If your kitchen runs warm, you can refrigerate them for up to 5 days; just let them sit at room temperature for 15–20 minutes before serving so the texture softens again.

For longer storage, freeze individual squares wrapped tightly in plastic wrap and then placed in a freezer bag or sealed container. They’ll keep well for up to 2 months. Thaw at room temperature or warm gently in the microwave for a few seconds to bring back that fresh-baked softness.

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Frequently Asked Questions

Can I use another brand of cookie butter instead of Biscoff?
Yes, any smooth cookie butter-style spread will technically work, but Biscoff has a distinct caramelized spice flavor that really shines in these blondies. If you swap the brand, expect a slightly different flavor, though the texture should remain similar.

Do I have to use both brown and white sugar?
Using a combination of brown and granulated sugar gives you the best of both worlds: moisture and chew from the brown sugar, plus structure and sweetness from the granulated sugar. If needed, you can use all brown sugar for extra chewiness, but the blondies may bake up a bit denser and darker.

How do I know when the blondies are done baking?
Look for edges that are set and golden and a center that no longer looks wet but still has a slight jiggle. A toothpick inserted into the center should come out with a few moist crumbs. If it’s completely clean, you may have overbaked them; if it’s still wet, give them a few more minutes.

Can I add chocolate chips or other mix-ins?
Absolutely. White chocolate chips, dark chocolate chunks, or even chopped toasted pecans are all delicious additions. Fold up to 1 cup of mix-ins into the batter along with the Biscoff cookie pieces to avoid overcrowding the pan.

Can I double this recipe for a larger crowd?
Yes, you can double the ingredients and bake them in a 9×13-inch pan. Add a few extra minutes to the bake time and keep a close eye on the center. The blondies should still look slightly underbaked when you pull them from the oven for the best fudgy texture.

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Want More Dessert Bar Ideas?

If these Biscoff Blondies have you craving more chewy, slice-and-share treats, you’ll love exploring a few of our other dessert bar recipes:

• Try these cozy Oatmeal Bars with a buttery, fruity crumb when you want something nostalgic and snackable.
• Bake up Apple Bars with a cinnamon-spiced crust for a fall-friendly dessert that tastes like apple pie in bar form.
• For extra gooey goodness, make a pan of Butterscotch Bars that are soft, saucy, and Southern-sweet.
• If you’re a chocolate lover, slice into Rocky Road Brownies loaded with marshmallows and nuts for a rich, crowd-pleasing treat.

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Save This Pin For Later

📌 Save these Biscoff Blondies to your favorite dessert board on Pinterest so you can bake them anytime a cookie butter craving hits.

And when you do, come back and let me know how yours turned out. Did you swirl extra Biscoff on top? Did you sneak in chocolate chips or keep them pure and simple?

I love seeing the twists you put on these bars. If you want even more sweet inspiration, you can follow my Mad For Meals Pinterest boards where I share new dessert bars, cookies, breakfast bakes, and weeknight dinners all the time.

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