Chilled Double Fudge Cookies with Dark Chocolate Ganache Step-by-step instructions

Before you start

Before starting, make sure the butter is softened to room temperature for easy creaming. Line a baking sheet with parchment paper. Gather all ingredients and equipment. If using a stand mixer, fit it with the paddle attachment.

Have a piping bag or zip-top bag ready for the ganache. The dough needs to chill for at least 30 minutes, so plan accordingly. The total time includes chilling and resting periods, which are essential for the final texture.

Instructions

Dough and Chill

1. 1Make the Cookie Dough
   In a large bowl, cream the softened butter and brown sugar together with an electric mixer until light and fluffy, about 2 minutes. Add the eggs one at a time, beating well after each addition. Sift the Dutch-process cocoa and all-purpose flour into the bowl, then mix on low speed until just combined. The dough will be thick and fudgy.
   Look for The dough is thick, dark, and holds together when pressed.
   Tip Do not overmix once the flour is added; overworking can make the cookies tough.
2. 2Shape and Chill the Dough
   Scoop the dough into 4-inch pucks, about 1/2 cup each, and place them on a parchment-lined baking sheet. Cover and refrigerate for at least 30 minutes, or until firm. Chilling is essential for thick, bakery-style cookies that don't spread too much.
   Look for The dough pucks are firm to the touch and hold their shape.
   Tip For even baking, make sure all pucks are roughly the same size and thickness.

At the end of this phase, you should have a thick, dark chocolate dough that holds together when pressed. The dough pucks are firm after chilling and hold their shape on the baking sheet. The aroma is rich and chocolatey, with a hint of brown sugar. The dough should not be sticky to the touch, and the pucks should be uniform in size for even baking.

Bake and Cool

3. 3Bake the Cookies
   Preheat the oven to 350°F (175°C). Place the chilled dough pucks on a parchment-lined baking sheet, spacing them at least 2 inches apart. Bake for exactly 9 minutes. The cookies will look slightly underdone in the center but will set as they cool.
   Look for The edges are set and the tops look slightly cracked, but the centers are still soft.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip Do not overbake; the cookies continue to set as they cool, keeping them fudgy.
4. 4Cool and Chill Completely
   Remove the baking sheet from the oven and let the cookies cool on the sheet for 5 minutes. Then transfer them to a wire rack to cool completely. Once at room temperature, place the cookies in the refrigerator and chill for at least 30 minutes, or until completely cold. This step is crucial for the ganache to set properly.
   Look for The cookies are completely cool and firm to the touch.
   Tip Chilling the cookies before adding ganache prevents the ganache from melting and sliding off.

The cookies emerge from the oven with set edges and soft, slightly puffed centers. The tops may have a few cracks, and the chocolate aroma fills the kitchen.

After cooling, the cookies are firm enough to handle but still tender inside. The chilling step makes them completely cold, which is essential for the ganache application. The texture is dense and fudgy, not cakey.

Ganache and Finish

5. 5Make the Ganache
   In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer. Remove from heat and add the dark chocolate chips. Let it sit for 2 minutes, then whisk until smooth and glossy. Let the ganache cool slightly until it thickens to a piping consistency, about 5 minutes.
   Look for The ganache is smooth, shiny, and thick enough to hold its shape.
   Tip If the ganache is too thin, let it cool a bit longer; if too thick, warm it gently.
6. 6Pipe the Ganache
   Transfer the ganache to a piping bag fitted with a large round tip. Pipe warm ganache in a swirl across the top of each chilled cookie. Work quickly so the ganache doesn't set before you finish piping all the cookies.
   Look for The ganache forms a beautiful swirl on top of each cookie.
   Tip If you don't have a piping bag, use a zip-top bag with a corner snipped off.
7. 7Chill and Serve
   Place the finished cookies back in the refrigerator for at least 15 minutes to allow the ganache to set. Serve chilled or at room temperature. For the ultimate experience, enjoy them straight from the fridge.
   Look for The ganache is firm and the cookies are cold and fudgy.
   Tip Store any leftovers in an airtight container in the refrigerator.

The ganache is smooth, glossy, and thick enough to pipe. When piped onto the cold cookies, it holds its shape and forms an elegant swirl. After chilling, the ganache sets to a firm, shiny finish. The final cookies are cold, with a contrasting texture between the dense cookie and the creamy ganache. They look professional and inviting.

Common mistakes

One common mistake is overbaking the cookies, which results in dry, cakey textures instead of fudgy centers. Another is skipping the chilling step, causing the cookies to spread too much and lose their thick shape. When making the ganache, avoid overheating the cream, as it can separate.

Also, ensure the cookies are completely cold before piping the ganache, or it will melt and slide off. Finally, use a kitchen scale for accurate flour measurement if possible, as too much flour can make the dough dry.

How to tell it’s done

The cookies are done when the edges are set and the tops look slightly cracked, but the centers are still soft. A toothpick inserted into the center should come out with a few moist crumbs, not wet batter.

The internal temperature of the cookies should reach at least 160°F (71°C) to ensure the eggs are fully cooked. Remember that the cookies will continue to set as they cool, so avoid overbaking. The ganache is ready when it's smooth and thick enough to hold its shape when piped.

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