Cookie Butter Tres Leches Cake: The Soaked Cake That Redefines Dessert
A light, airy Biscoff-infused sponge gets drenched in a warm cookie butter milk mixture, then chilled until velvety smooth. The key is folding the egg whites gently for lift and letting the cake soak overnight for the most luscious, spoon-tender texture you can imagine. It's a showstopper for summer parties and holiday tables alike.
Equipment
- 9x13 baking dish
- Stand mixer with paddle and whisk attachments
- Hand Mixer
- Large mixing bowls
- Offset spatula
- Wooden skewer or fork
- Plastic wrap
Ingredients
- 1½ cups cake flour
- ½ cup Biscoff cookies finely ground
- 1 tsp ground cinnamon
- 1 tsp baking powder
- ½ tsp kosher salt
- ⅔ cup sugar
- 6 large eggs separated
- 2 tsp vanilla extract
- ¾ tsp cream of tartar
- 1½ cups heavy cream (or whole milk) divided
- 1 14oz can sweetened condensed milk
- 1 12oz can evaporated milk
- ½ cup creamy cookie butter microwaved for 20-30 seconds until warm
- 1½ cups cold heavy whipping cream
- 2 Tbsp confectioners' sugar
- ½ tsp ground cinnamon
- ⅓ cup crushed Biscoff cookies for garnish
Instructions
- Preheat your oven to 350°F (175°C) with a rack in the center. Grease your 9x13 baking dish well with butter or nonstick spray.
- Mix the dry team: In a large bowl, whisk together the cake flour, finely ground Biscoff cookies, ground cinnamon, baking powder, and kosher salt. Set it aside.
- Beat the yolks and sugar: In your stand mixer bowl with the paddle attachment, beat the sugar and egg yolks on medium-high speed (speed 6-7) for a full 5 minutes. You want it thick, pale, and “ribbony” — when you lift the paddle, the mixture falls back into the bowl in a thick, slow ribbon.
- Add the liquid: Turn the mixer to low and add the vanilla extract and ½ cup of heavy cream. Mix until just combined. It will look a little thin — that’s okay.
- Fold in the dry ingredients: Take the bowl off the mixer. Gently fold the flour mixture into the yolk mixture with a rubber spatula until no streaks remain. Transfer this batter to a large mixing bowl (you’ll need the stand mixer bowl for the egg whites).
- Whip the egg whites: Place the 6 egg whites into the clean stand mixer bowl. Add the cream of tartar. Using the whisk attachment, start on medium speed until frothy, then increase to high speed. Beat until stiff, glossy peaks form, about 3 minutes. They should hold their shape firmly without being dry or grainy.
- Fold everything together: This is the most important step. Take a big scoop of the egg whites (about a third) and fold it gently into the batter to lighten it. Then gently fold in the remaining egg whites in two more batches. Use a wide rubber spatula and cut through the center, scraping the bottom, and turning the bowl. Don’t rush — you want to keep as much air in the batter as possible.
- Bake the sponge: Pour the batter into your prepared dish. Use an offset spatula to smooth it into an even layer. Bake for 15-20 minutes, or until the top springs back when gently touched and a wooden skewer inserted into the center comes out clean. The kitchen will smell like cinnamon toast.
- Make the soak: While the cake bakes, whisk together the remaining 1 cup of heavy cream, the can of sweetened condensed milk, and the can of evaporated milk in a bowl. Microwave the cookie butter for 20-30 seconds until it’s warm and runny, then whisk it into the milk mixture until completely smooth.
- Soak the hot cake: As soon as the cake comes out of the oven, use a wooden skewer or fork to poke holes all over the top — go all the way to the bottom. Slowly pour the milk mixture evenly over the entire cake. Let it cool on the counter for 30 minutes.
- Chill overnight: Cover the dish with plastic wrap and refrigerate for at least 4 hours, but overnight is truly best. The cake gets softer, the flavors meld, and everything sets up perfectly.
- Top and serve: When you’re ready to serve, whip the cold heavy whipping cream, confectioners’ sugar, and ground cinnamon in the stand mixer with the whisk attachment. Aim for medium-stiff peaks — they spread beautifully but still hold their shape. Spread it into an even layer on top of the chilled cake, garnish with crushed Biscoff cookies, and dig in.
Notes
My Best Advice for This Cookie Butter Tres Leches Cake:
- Don't overbake the sponge. 18 minutes is usually the sweet spot. A dry, overbaked sponge can't soak up the milk mixture properly — it will just repel it. As soon as it springs back, pull it out.
- Warm the cookie butter. This small step makes a huge difference. Cold cookie butter seizes into hard little lumps in the cold milk. Warming it first melts it right in, creating a perfectly smooth, unified soak.
- Pour the soak slowly. Don't dump it all in the center. Pour it in a slow, steady stream, working your way from the edges to the middle. Give it a few seconds to sink in before adding more. Even if you mess this up a little, it'll still taste incredible.
- Use room temperature eggs. Cold eggs won't whip up to the same volume as room temperature eggs. Let them sit on the counter for 30 minutes before you start. It makes a noticeable difference in the lift of your sponge.