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Desserts · Part 2 of 3: Instructions

No-Bake Oreo Fudge Mocha Tiramisu Box Step-by-step instructions

A towering, decadent Oreo Fudge Mocha Tiramisu Box with visible layers of chocolate mousse and espresso-soaked cookies.
Prep
Cook
Total
Serves
9
Includes 4 h resting

Before you start

Before starting, ensure all ingredients are measured and ready. Bring the mascarpone to room temperature for about 30 minutes to ensure a smooth whip. Melt the dark chocolate and let it cool slightly.

Brew the espresso or strong coffee and allow it to cool completely. Have a 9x9-inch baking dish or acrylic box ready. Prepare a shallow dish for dipping the cookies. Keep the heavy cream in the refrigerator until the moment of whipping.

Ingredients at a glance (9)
  • 450 g mascarpone cheese
  • 150 g dark chocolate, melted
  • 80 g powdered sugar
  • 250 ml cold heavy cream
  • 24 ladyfingers
  • 20 Oreo cookies
  • 1 1/2 cups strong brewed espresso or coffee, cooled
  • 2 tbsp unsweetened cocoa powder
  • 1/2 cup crushed Oreo crumbs

Instructions

Whip and Dip

  1. Whip the Chocolate Mousse
    In a large mixing bowl, combine the mascarpone cheese, melted dark chocolate, and powdered sugar. Beat with an electric mixer on medium speed until smooth and creamy. Gradually pour in the cold heavy cream while continuing to beat. Increase the speed to high and whip until stiff peaks form and the mixture is light and fluffy. Be careful not to overbeat, as the mixture can curdle. The mousse should hold its shape when the whisk is lifted.
    Look for The mixture is thick, glossy, and holds stiff peaks without drooping.
    Tip Ensure the mascarpone is at room temperature for a smooth blend, but keep the heavy cream very cold for best volume.
  2. Prepare the Dipping Liquid
    Pour the cooled espresso or strong coffee into a shallow dish. The dish should be wide enough to dip the ladyfingers and Oreos easily. Set aside.
    Look for The espresso is cool to the touch, not hot, to avoid softening the cookies too quickly.
    Tip If the coffee is too hot, it will make the cookies mushy. Let it cool completely before dipping.

After this phase, you should have a bowl of glossy, thick chocolate mousse that holds stiff peaks, and a plate of espresso-dipped cookies that are moist but still firm. The mousse should be smooth and spreadable, with no lumps. The cookies should be evenly coated with coffee but not falling apart. This sets the stage for easy layering.

Layer and Chill

  1. Dip the Cookies
    Working one at a time, dip each ladyfinger into the espresso for about 1 second per side. The ladyfinger should be moistened but not soaked through. Similarly, dip each Oreo cookie into the espresso for about 1 second per side. The Oreos should absorb some coffee but remain intact. Place the dipped cookies on a plate as you go.
    Look for The cookies are damp but still firm enough to hold their shape when lifted.
    Tip Do not let the cookies sit in the coffee; a quick dip is enough to infuse flavor without making them soggy.
  2. Layer the Tiramisu
    Spread a thin layer of the chocolate mascarpone mousse on the bottom of a 9x9-inch baking dish or acrylic box. Arrange a layer of dipped ladyfingers side by side to cover the bottom. Spread half of the remaining mousse over the ladyfingers, smoothing it into an even layer. Top with a layer of dipped Oreo cookies, then spread the remaining mousse over the Oreos. Smooth the top with a spatula.
    Look for The layers are even and the top is smooth, with the cookies fully covered by mousse.
    Tip Press the cookies gently into the mousse to ensure they stay in place while chilling.
  3. Chill the Tiramisu
    Cover the dish with plastic wrap or a lid and refrigerate for at least 4 hours, or overnight, until the tiramisu is set and the flavors have melded. The chilling time allows the cookies to soften and the mousse to firm up, making it easy to slice and serve.
    Look for After chilling, the tiramisu is firm and holds its shape when a spoon is inserted.
    Safe temperature 160°F (71°C) internal temperature (egg dishes)
    Tip For a cleaner cut, chill for at least 6 hours or overnight. Use a sharp knife dipped in hot water for neat slices.

The assembled tiramisu should have even layers of mousse and cookies, with the top smoothed. After chilling, the dessert should be firm and hold its shape when a spoon is inserted.

The cookies should have softened to a cake-like texture, and the mousse should be set but still creamy. The flavors should have melded, creating a harmonious coffee-chocolate taste.

Finish and Serve

  1. Finish and Serve
    Before serving, dust the top generously with unsweetened cocoa powder using a fine-mesh sieve. Sprinkle the crushed Oreo crumbs evenly over the cocoa. To serve, scoop out portions with a large spoon, ensuring each serving includes all layers. The tiramisu can be served directly from the dish.
    Look for The top is evenly dusted with cocoa and crumbs, creating a beautiful contrast.
    Tip For a decorative touch, use a stencil to create a pattern with the cocoa powder.

The finished tiramisu is dusted with cocoa and crumbs, creating a beautiful presentation. When served, each spoonful should include all layers: the creamy mousse, the tender cookies, and the crunchy topping. The dessert should be cold, with a rich, fudgy texture and a strong coffee aroma. It should be easy to scoop and hold its shape on the spoon.

Common mistakes

One common mistake is overbeating the mascarpone mixture, which can cause it to curdle. Beat just until stiff peaks form, and stop as soon as the mixture holds its shape. Another mistake is dipping the cookies too long, resulting in a soggy bottom layer.

A quick dip of 1 second per side is sufficient. Also, ensure the espresso is completely cooled; hot coffee will melt the mousse and make the cookies fall apart. Finally, do not skip the chilling time—it is essential for the dessert to set properly.

How to tell it’s done

The tiramisu is done when it has chilled for at least 4 hours and is firm to the touch. When you insert a spoon, it should come out clean, and the layers should be distinct. The mousse should be set but still creamy, not runny.

The cookies should be tender but not mushy. If you cut into it, the slices should hold their shape. For the best flavor, let it sit at room temperature for 10 minutes before serving to soften slightly.

  • Egg dishes: 160°F (71°C) in the thickest part

Coming up in Part 3: common questions

  • Can this tiramisu be made without coffee?
  • How long does the tiramisu need to chill?
  • Can this recipe be made gluten-free?
  • Why is the mousse runny?
  • Can this tiramisu be frozen?

Also in Part 3: variations (Mocha Nut Tiramisu, Peppermint Chocolate Tiramisu, Caramel Drizzle Tiramisu, Berry Tiramisu), storage and make-ahead, and the printable recipe card.

Up next · Part 3 of 3

4 variations · storage & make-ahead · 5 answers · printable card

Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)