Ingredients
Scale
- 1 3/4 cups (230g) all purpose flour
- 1/4 cup (30g) cornstarch
- 1 cup (100g) unsweetened cocoa powder
- 2 tsp baking soda
- 1 tsp baking powder
- 1/2 tsp kosher salt
- 1 cup (200g) granulated sugar
- 1 cup (205g) dark brown sugar, packed
- 1/2 cup (108g) vegetable oil
- 1 cup (230g) mayonnaise
- 3 large eggs + 1 egg yolk
- 1/2 cup (128g) milk
- 1 tbsp vinegar
- 2 tsp vanilla extract
- 1 cup (240g) hot coffee (or 1 cup hot water + 2 tsp instant espresso powder)
- 2 cups (450g) unsalted butter, room temp
- 1 1/2 cups (165g) powdered sugar
- 3 tbsp corn syrup
- 1 tsp vanilla extract
- Pinch of kosher salt
- 3/4 cup (177g) warm water
- 3/4 cup (75g) dutch process cocoa powder (or unsweetened cocoa powder)
- 10 oz dark chocolate chips (one bag), melted and cooled slightly
Instructions
- Preheat the oven to 350°F and prepare 3 8" cake pans by greasing and lining with parchment paper.
- In a medium bowl, whisk together the flour, cornstarch, cocoa powder, baking soda, baking powder, and salt. Set aside.
- In a measuring glass, combine milk, vinegar, and vanilla extract; set aside.
- In a large bowl, mix the sugars, vegetable oil, and mayonnaise, then add the eggs and egg yolk and whisk until combined.
- Blend in the milk mixture until well incorporated.
- Gradually add half of the dry ingredients, whisk to combine, then add hot coffee and the remaining dry ingredients, mixing until the batter is thin and liquid.
- Divide the batter evenly among the prepared pans.
- Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean with a few moist crumbs.
- Allow the cakes to cool in the pans for about 10 minutes, then run a knife around the edges and carefully turn them out onto a cooling rack. Cool completely before frosting.
Notes
For an even richer taste, use high-quality dark chocolate for the frosting.
You can substitute the mayonnaise with sour cream for a different flavor profile.
This cake freezes well; wrap in plastic wrap and store in an airtight container for up to a month.
Nutrition
- Serving Size: 1 slice (approx. 1/10 of cake)
- Calories: 380
- Sugar: 30g
- Sodium: 260mg
- Fat: 18g
- Saturated Fat: 4g
- Unsaturated Fat: 11g
- Trans Fat: 0g
- Carbohydrates: 56g
- Fiber: 2g
- Protein: 5g
- Cholesterol: 45mg
Nutritional information is an estimate. The nutritional values for your final dish may vary based on measuring differences and products used.