Introduction

Espresso chip tiramisu cookie bars combine the rich flavors of coffee and chocolate with a creamy mascarpone topping for a delightful twist on classic cookie bars. Perfect for coffee lovers and dessert fans alike, these bars offer a satisfying balance of textures and tastes.

A stack of four square brownie bars is shown on a white marbled surface. Each bar has two layers: the bottom layer is dark brown with visible chunks of melted chocolate, showing a moist and dense texture, while the top layer is a thick, creamy white frosting dusted generously with a fine layer of cocoa powder. The top bar has a bite taken out of one corner, revealing the rich, gooey texture inside. The edges of the frosting on the bitten part show softness and slight melting. Photo taken with an iphone --ar 4:5 --v 7

Ingredients

12 tablespoons (170g) unsalted butter
3 tablespoons (11g) instant espresso powder*
2/3 cup (127g) light brown sugar
1/3 cup (64g) granulated sugar
1 1/2 teaspoon vanilla extract
1 large egg + 1 large egg yolk
1 2/3 cup (200g) all purpose flour
3/4 teaspoon baking soda
1/2 teaspoon salt
A shy 2/3 cup (3.5oz) dark chocolate bar, chopped
2/3 cup (4oz) semisweet chocolate chips
8 oz mascarpone, cold
1 cup (120g) powdered sugar
1 teaspoon vanilla extract
3/4 cup heavy cream, cold
1-2 tablespoons cocoa powder

*Use an espresso powder ground finely and intended for baking, such as DeLallo brand, for best results.

Instructions

Step 1: Melt the unsalted butter in a heavy-bottomed pot over low heat. Stir in the instant espresso powder until it is submerged in the butter and releases a strong aroma. It does not need to be fully combined.
Step 2: Add both the light brown sugar and granulated sugar to the butter-espresso mixture. Use a spatula to combine everything thoroughly.
Step 3: Mix in the egg, egg yolk, and vanilla extract. Continue mixing with some speed, scraping the sides and bottom of the bowl, until the mixture lightens in color.
Step 4: Sift together the all-purpose flour, baking soda, and salt. Fold these dry ingredients into the wet mixture gently until a shaggy dough forms.
Step 5: Stir in the chopped dark chocolate and semisweet chocolate chips until evenly dispersed within the dough.
Step 6: Line a 9×9 inch square pan with parchment paper. Spread the espresso chip cookie dough evenly in the pan. Refrigerate uncovered for 2 hours. For longer chilling, cover with plastic wrap and chill up to 24 hours.
Step 7: Preheat your oven to 350°F (175°C). Bake the cookie bars for 24 to 26 minutes until the top is shiny and the bars no longer jiggle when the pan is shaken.
Step 8: Let the cookie bars cool completely—about 1 hour at room temperature, then 1 to 2 hours in the refrigerator.
Step 9: To prepare the mascarpone topping, combine the cold mascarpone, powdered sugar, and vanilla extract in a bowl. Mix until smooth with no lumps.
Step 10: In a separate bowl, whip the cold heavy cream with a hand mixer until stiff peaks form. Carefully fold the whipped cream into the mascarpone mixture until fully incorporated.
Step 11: Spread or pipe the mascarpone topping evenly over the chilled cookie bars. Sift 1 to 2 tablespoons of cocoa powder over the top using a mesh strainer.
Step 12: For clean slicing, chill the finished bars in the refrigerator for an additional 1 to 2 hours before cutting and serving. Enjoy cold.

Tips & Variations

Use a high-quality espresso powder designed for baking to ensure the best flavor and powder consistency.
Chilling the dough overnight enhances the flavor and texture of the cookie bars.
You can substitute dark chocolate with bittersweet or milk chocolate based on your preference.
For a stronger coffee flavor, add an extra teaspoon of espresso powder to the dough.

Storage

Store the espresso chip tiramisu cookie bars in an airtight container in the refrigerator. They will keep well for 3 to 4 days. These bars are best enjoyed cold, so reheat is not recommended. You may bake the cookie base ahead of time and add the mascarpone topping shortly before serving to extend freshness.

How to Serve

The image shows a stack of four square dessert bars on a white marbled surface. Each bar has two layers: the bottom layer is a dark brown chocolate chip cookie base with chunks of chocolate visible, and the top layer is a thick, creamy white topping dusted evenly with cocoa powder. The top bar has a bite taken out of its upper corner, revealing the soft texture of the frosting and the dense cookie base below. The background is plain with a smooth white color, emphasizing the layered bars. photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use regular instant coffee instead of espresso powder?

Regular instant coffee is not as strong or finely ground as espresso powder used for baking, so it may not provide the same intense coffee flavor or dissolve properly in the butter. For best results, stick to espresso powder.

Can these bars be frozen?

While the cookie base can be frozen before adding the mascarpone topping, freezing the finished tiramisu cookie bars with the mascarpone may affect the texture. It’s best to freeze the base separately and add the topping after thawing.