1) Freeze the cookie butter layer

Take a large sheet of parchment paper and press it into a square 8×8 metal baking pan, making sure the paper creases along the bottom edges so you can see the pan’s shape. Spread the Biscoff cookie butter evenly inside that outlined square. Place it in the freezer and let it firm up completely before making the brownie batter. This step is important because a fully frozen layer holds its shape much better during assembly and baking.

2) Line the pan and heat the oven

Once the cookie butter layer is firm, line the baking pan with parchment paper again, leaving extra paper hanging over all four sides for easy lifting later. Preheat the oven to 350°F / 180°C so it is ready when the batter is assembled.

3) Mix the sugars, eggs, and vanilla

In a medium mixing bowl, whisk together the brown sugar, granulated sugar, eggs, egg yolk, and vanilla extract. Continue whisking until the mixture looks pale, thick, and well blended. This creates the base that helps the brownies bake up with a glossy top and rich texture.

4) Melt the chocolate mixture

Place the butter and chocolate chips together in a microwave-safe bowl or a small saucepan. Heat gently until everything melts into a smooth mixture, stirring as needed so it does not scorch. Whisk in the cocoa powder until the chocolate mixture looks fully combined and silky.

5) Combine the chocolate and egg mixture

Slowly pour the melted chocolate mixture into the bowl with the eggs and sugar, whisking the whole time. Mix only until the batter comes together and looks smooth. Do not overwork it, because you want these Biscoff Brownies to stay dense and fudgy rather than airy.

6) Fold in the dry ingredients

Add the flour, espresso powder, and salt to the bowl. Use a spatula to gently fold everything together until the flour disappears and the batter looks uniform. Stop as soon as the dry streaks are gone. Overmixing can make the brownies tougher and less fudgy.

7) Layer the batter and cookie butter

Scoop about half of the brownie batter into the prepared pan and spread it evenly to the edges. Remove the frozen cookie butter layer from the freezer, peel off the parchment, and set the solid square over the batter.

Spread the rest of the brownie batter over the top of the cookie butter layer, smoothing it outward so the layer is covered evenly from edge to edge.

8) Add the toppings

Break the Biscoff cookies into pieces and press them gently over the brownie batter. Warm a couple of tablespoons of extra cookie butter in the microwave for 15 to 20 seconds, just until it becomes loose and drizzly. Spoon or drizzle that over the top of the brownies for extra Biscoff flavor.

9) Bake the brownies

Bake the pan in the preheated oven for 30 to 40 minutes. The brownies are ready when a toothpick inserted in the center comes out with a few moist crumbs attached. It should not come out clean, because that usually means the brownies are overbaked. The center should still feel soft and slightly fudgy.

10) Cool and serve

 

Set the pan on a wire rack and let the brownies cool completely before trying to lift or cut them. Once fully cool, remove them using the parchment overhang. Add more warmed cookie butter on top if you want, then slice into squares and serve.