Recipe

Biscoff Cookie Butter Blondies

Chewy blondies with crisp edges, a glossy top, and that caramelized Biscoff spice in every bite.

By Matt Campbell

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4.8

A pan of Biscoff cookie butter blondies cut into squares, with a glossy crinkly top and visible cookie butter swirls on a light stone kitchen counter

If a chewy blondie and a spoonful of Biscoff cookie butter had a very delicious plan, this would be it. These bars bake up buttery and dense in the best way, with crisp edges and a crackly top that makes you feel like you did something impressive, even if you mixed it all in one bowl while your coffee was still hot.

We lean into the Biscoff vibe on purpose: cookie butter in the batter, a swirl on top, and crushed cookies for that little crunch that keeps you going back for “one more sliver.” They travel well, slice clean, and make your kitchen smell like caramel and warm spice for a solid hour. Not mad about it.

Why It Works

Big Biscoff flavor without being overly sweet: cookie butter brings caramelized spice, and a touch of salt keeps it balanced.
Chewy centers, crisp edges: baking at 350°F and pulling them when the center looks just set gets you that ideal blondie texture.
One-bowl, low-drama method: melted butter, whisk, fold, swirl, bake. No mixer needed.
The swirl is the trick: warming cookie butter for a few seconds makes it easy to marble without tearing the batter.

A neat ingredient lineup on a kitchen counter including Biscoff cookies, a jar of cookie butter, flour, brown sugar, eggs, vanilla, butter, and salt in small bowls

Pairs Well With

Storage Tips

Keep Them Chewy

Room temperature: Store in an airtight container for up to 4 days. Add a slice of sandwich bread to the container if your kitchen runs dry, as it helps keep the bars soft.
Refrigerator: Up to 1 week, tightly covered. This is best for longer storage, but the texture will firm up and can dry slightly. Let bars sit at room temp 20 to 30 minutes before eating.
Freezer: Freeze sliced bars up to 2 months. Wrap each square in plastic wrap, then stash in a freezer bag. Thaw overnight in the fridge or 1 to 2 hours on the counter.
Warm-up move: A 10-second microwave zap brings back the gooey cookie butter vibe.

Common Questions

What is Biscoff, exactly?

Biscoff is a brand of speculoos-style cookies: crisp, caramelized, and warmly spiced. Cookie butter is basically those cookies turned into a spread. The flavor reads like cinnamon, brown sugar, and toasted caramel.

Can I use crunchy cookie butter?

Yes. Crunchy cookie butter works great here. If it is very thick, warm it briefly so it swirls easily.

Why did my blondies turn out cakey?

Usually it is one of three things: too much flour (scoop-and-level, do not pack), overmixing after adding flour, or baking too long. Pull them when the center is set but still looks a little soft and glossy.

Can I make these in a 9x13-inch pan?

Yes. Double the recipe and bake in a 9x13-inch pan. Start checking around 24 to 28 minutes, and know it may take up to 32 to 35 minutes depending on your pan and oven. You want a set top and a toothpick that comes out with moist crumbs.

Do I have to use parchment paper?

It is not mandatory, but it makes lifting and slicing so much easier. If you skip it, grease the pan well and let the bars cool completely before cutting.

What if I only have a glass or ceramic pan?

You can still make them. Glass and ceramic tend to bake a little slower and can brown the edges differently. Plan on a few extra minutes, and start checking doneness early. If your edges brown too fast, drop the oven to 325°F (165°C) next time.

Matt Campbell

I have always had a huge passion for the culinary arts, people, working as a team, and so on. I wanted to pursue my love for cooking initially at Virginia Commonwealth University with a culinary arts degree; however, I instead decided to apply myself and acquire more practical skills. My end goal is to eventually open my own restaurant or similar establishment.

Kitchen Essentials

8x8-inch metal baking pan
Parchment paper
Large mixing bowl
Whisk
Rubber spatula
Measuring cups and spoons
Microwave-safe bowl (to warm cookie butter)
Wire rack for cooling

I love ambitious kitchen projects, but I also love the kind of dessert you can throw together while dinner is in the oven. The first time I made these, I was aiming for “something snacky” and accidentally landed on “why is everyone hovering around the pan.” Cookie butter does that. It is sweet, spiced, and weirdly comforting, like a shortcut to a bakery smell. Now I keep a sleeve of Biscoff in the pantry for emergencies, which in my house means Tuesdays.

A large mixing bowl of blondie batter with a whisk resting inside on a warm-lit kitchen counter, with a jar of Biscoff cookie butter nearby