Biscoff Blondies

By Wendy Sondov · Published: Jul 26, 2025 · This post may contain affiliate links · As an Amazon Associate I earn from qualifying purchases.

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Biscoff Blondies are thick, chewy bars filled with the delicious spices of Biscoff butter. Topped with Biscoff icing and crunchy toffee bits, these treats are irresistible.

Squares of Biscoff Blondies drizzled with Biscoff icing and sprinkled with toffee bits.

Why you'll love this recipe

This is a chewy, dense bar full of Biscoff spice flavor and toffee crunch.
The Biscoff icing dries and firms beautifully for stacking and care package mailing.
These blondies maintain their freshness for at least one week.

Biscoff (cookie butter) fans, are going to love these chewy, spiced Biscoff Blondies. Drizzle on the icing or spread it to cover the whole top. Add a sprinkle of toffee bits for added crunch and warm brown sugar flavor.

If nut allergies keep you from using packaged toffee (Heath baking bits) which contains almonds, homemade toffee bits are easy to make. Try my recipe for nut-free toffee bits.

Ingredients

This is an overview of the ingredients. The full measurements and detailed instructions are in the printable recipe card at the bottom of the page.

Biscoff butter (cookie butter): Sold in the peanut butter aisle of the supermarket, this sweet, spiced spread is made with speculoos cookies, ginger-cinnamon cookies from the Netherlands. The Trader Joe's brand of cookie butter will also work in this recipe.
Toffee bits: Packaged toffee bits for baking contain almonds. Homemade crunchy toffe bits can be used for nut free bars.

Instructions

This is an overview of the instructions. The full instructions are in the recipe card below.

Mix butter, cookie butter (Biscoff butter), brown sugar, eggs, and vanilla until light and fluffy.
Add the dry ingredients and combine to form a thick dough. Stir in the toffee bits.
Spread the dough evenly into a parchment lined baking pan. Binder clips are helpful to hold the parchment in place while spreading the dough.
Bake for 22-24 minutes or until the top is golden and a toothpick inserted into the middle of the blondies comes out clean.

Icing instructions: Combine ingredients until smooth then transfer into a ziplock bag with a small bottom corner cut off, zigzag icing over blondies and sprinkle with toffee bits.

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Mix together the icing ingredients until smooth and place in a small zip lock bag. Cut off a small piece of a bottom corner of the bag.
Drizzle the icing over the blondies and sprinkle immediately with toffee bits.

Storage

Store the cookie butter bars at room temperature in between layers of wax paper in an air tight container or wrapped in plastic wrap inside an air tight container for up to one week.

A stack of three cookie butter bars showing the dense, chewy texture dotted with crunchy bits of toffee.

Tips and variations

White chocolate or semisweet chocolate chips are a delicious add in to these bars. Add ½ cup of chips in addition to the tofee bits.
The icing can be made thinner for drizzling or thicker for spreading.
Drizzle the icing from a plastic ziplock bag or from a spoon or fork.

Butterscotch Peanut Bars are chewy bars with a butter cookie base topped with peanuts and butterscotch.

Chocolate Chip Cookie Bars are thick, soft, and chewy.

Biscoff Mug Cake is a one minute microwave cake full of spiced Biscoff flavor.

Biscoff Oatmeal Crunch Cookies are deliciously crisp and crunchy!

A serving plate filled with Biscoff Blondie bars topped with drizzled Biscoff icing and sprinkled with crunchy toffee bits.

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