Secret-Ingredient Dark Chocolate Cake

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A secret-ingredient chocolate cake guaranteed to be moist and delicious. Use your favorite frosting.

Prep Time:
30 mins
Cook Time:
35 mins
Additional Time:
15 mins
Total Time:
1 hr 20 mins
1 3-tiered 8-inch cake


  • 1 ½ cups all-purpose flour

  • 1 cup Dutch-processed unsweetened cocoa powder

  • 1 ½ teaspoons baking soda

  • 1 teaspoon salt

  • ½ teaspoon baking powder

  • 1 ½ cups stout beer

  • 1 tablespoon vanilla extract

  • 1 tablespoon instant espresso powder

  • 1 ½ cups white sugar

  • 1 cup butter

  • 2 large eggs

  • ½ cup mayonnaise

  • 1 (4 ounce) bar dark chocolate, chopped


  1. Preheat the oven to 325 degrees F (165 degrees C). Grease three 8-inch round cake pans and line bottoms with parchment paper.

  2. Sift flour, cocoa powder, baking soda, salt, and baking powder into a large bowl.

  3. Combine stout, vanilla extract, and espresso powder in separate bowl and stir.

  4. Beat sugar and butter together in another bowl until creamy, scraping sides occasionally. Add eggs, one at a time, mixing after each addition. Beat in mayonnaise. Alternate adding the flour and stout mixtures, 1/3 at a time, beating after each addition. Fold in dark chocolate just until combined. Split batter between the 3 prepared pans and level out the tops.

  5. Bake in the preheated oven until a toothpick inserted into the cakes comes out clean, about 35 minutes. Cool in the pans for 15 minutes, then run a knife around the edge and flip onto a cooling rack. Let cool completely.

Nutrition Facts (per serving)

450 Calories
28g Fat
48g Carbs
5g Protein
Nutrition Facts
Servings Per Recipe 12
Calories 450
% Daily Value *
Total Fat 28g 35%
Saturated Fat 12g 61%
Cholesterol 76mg 25%
Sodium 547mg 24%
Total Carbohydrate 48g 17%
Dietary Fiber 3g 12%
Total Sugars 30g
Protein 5g
Calcium 33mg 3%
Iron 2mg 11%
Potassium 152mg 3%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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