Biscoff Blondies

Why This Biscoff Blondies Recipe Works

Most biscoff blondie recipes stop at stirring in a scoop of cookie butter and calling it a day. I take it two steps further: chopped Biscoff cookies fold into the batter for little pockets of crunch, and a warm Biscoff drizzle goes over the top once the bars cool. Every layer reinforces that deep, caramelized flavor.

I also add a teaspoon of cinnamon to the dry ingredients. It sounds small, but it pulls out the spice notes already in the cookie butter and makes the whole bar taste more intentional. I’ve made these both ways and the version with cinnamon wins every time.

If these bars hit the spot, you’ll want to bookmark my Patriotic Blondies, Lemon Blondies, and Pumpkin Blondies too. Each one uses the same simple base method.

Ingredients

This is a quick overview of the ingredients you will need to make this recipe. You can find the full list in the recipe card at the bottom of the post.

• Unsalted butter — Melted butter keeps the texture fudgy and mixes in smoothly without a stand mixer.
• Light brown sugar — Packed brown sugar adds moisture and a deep caramel undertone that plays up the Biscoff flavor.
• Granulated sugar — A half cup of white sugar helps the edges set up golden and slightly crisp.
• Eggs — Two whole eggs give the bars structure so they hold their shape when sliced.
• Vanilla extract — Rounds out the sweetness and balances the spice in the cookie butter.
• Biscoff cookie butter — The hero of this recipe — it goes into the batter for flavor all the way through.
• All-purpose flour — Standard AP flour is all you need here; no specialty flours required.
• Baking powder — Just a teaspoon gives the bars a slight lift without making them cakey.
• Salt — Keeps the sweetness in check and sharpens every other flavor.
• Ground cinnamon — Pulls out the warm spice notes already in the Biscoff and makes the whole bar taste more complex.
• Chopped Biscoff cookies — Folded into the batter for crunch and little bursts of that signature cookie flavor.
• Biscoff cookie butter (topping) — Warmed and drizzled over the cooled bars for a glossy, flavor-packed finish.
• Crushed Biscoff cookies (topping) — Sprinkled on top for a little crunch and a pretty presentation.

How To Make Biscoff Blondies

1. In a large mixing bowl, whisk together the melted butter, brown sugar, and granulated sugar until smooth.Add the eggs and vanilla extract. Whisk until well combined.

2. Stir in the Biscoff cookie butter until smooth.

3. In a separate mixing bowl, whisk together the flour, baking powder, salt, and cinnamon.

4. Gradually stir the dry ingredients into the wet ingredients just until combined. Avoid overmixing. Gently fold in the chopped Biscoff cookies.

5. Spread the batter evenly in the prepared baking pan. Bake for 25–30 minutes, until the edges are golden brown and a toothpick inserted into the center comes out with a few moist crumbs. Avoid overbaking to keep the center soft and chewy.

6. Place the cookie butter for the topping in a small microwave-safe bowl. Microwave for 15–20 seconds, or just until loose enough to spread or drizzle. Spread or drizzle the warmed cookie butter over the cooled blondies. Sprinkle with the crushed Biscoff cookies.

Common Mistakes to Avoid When Making Blondies

• Skipping the cooling step before slicing. Warm blondies crumble when cut. Give them the full cool-down.
• Using cold butter. The recipe calls for melted butter, not softened. Cold or solid butter won’t combine with the sugars the same way and affects the final texture.
• Overbaking. The center will look slightly underdone when you pull the pan — that’s exactly right. It firms up as the bars cool in the pan.
• Measuring flour by scooping. Scoop-packing the measuring cup adds too much flour and dries the bars out. Spoon the flour into the cup and level it off.
• Skimping on the Biscoff. Three-quarters of a cup in the batter sounds like a lot — don’t reduce it. That’s where most of the flavor lives.

Frequently Asked Questions

How to Store and Reheat

• Storage — Keep the bars in an airtight container at room temperature for up to 4 days. Layer them with parchment paper if stacking to protect the drizzled topping.
• Freezing — Wrap individual bars tightly in plastic wrap, then place in a zip-top freezer bag. They’ll keep for up to 2 months. Freeze without the topping for best results, and drizzle fresh after thawing.
• Reheating — Pop a bar in the microwave for 10 to 15 seconds if you want it warm. Don’t overheat or the topping will melt off and the bar will dry out.