High Altitude Chocolate Mayonnaise Cake with Vanilla Buttercream
High altitude tested chocolate cake made with mayonnaise for an incredibly rich, tender, and moist cake crumb, frosted with fluffy vanilla buttercream.
All recipes on Curly Girl Kitchen are developed for high altitude at 5,280 feet. See FAQs for adjusting to higher or lower elevations.
Equipment
- Stand Mixer with Paddle Attachment
- 8-inch cake pans (x3)
Ingredients
Cake
- 2 cups all-purpose flour, fluffed, spooned and leveled
- 1 ¾ cups granulated sugar
- ¾ cup unsweetened, Dutch-processed cocoa powder (see recipe notes)
- 1-2 tbsp instant espresso powder or instant coffee, optional
- 1 tsp baking soda
- ½ tsp baking powder
- 1 tsp coarse Kosher salt (if using table salt, use half the amount)
- 4 large eggs, room temperature
- 1 cup whole milk, room temperature
- 1 cup sour cream, room temperature
- 1 cup mayonnaise
- 1 tbsp vanilla extract
Buttercream
- 2 cups unsalted butter, softened to room temperature
- 4 cups powdered sugar
- 1 tbsp meringue powder, optional
- ¼ tsp coarse Kosher salt (if using table salt, use half the amount)
- 2 tsp vanilla extract
- 2-4 tbsp milk, only if needed
Instructions
Cake
- Preheat the oven to 350 F, and spray the bottoms of three 8-inch cake pans with non-stick spray. If making half the recipe, use three 6-inch cake pans.
- In a large bowl, sift together the flour, sugar, cocoa powder, espresso powder, baking soda, baking powder and salt.
- Separately, whisk together the eggs, milk, sour cream, mayonnaise and vanilla. Add the wet ingredients to the dry, and whisk until combined, about 15 seconds.
- Divide the batter between the pans. Bake on the center oven rack for about 25-30 minutes, until the tops of the cakes spring back when lightly touched, or a toothpick or cake tester inserted in the center comes out clean.
- Set the pans on a cooling rack, cover loosely with a clean kitchen towel, and cool completely before frosting.
Buttercream
- In the bowl of your stand mixer fitted with the paddle attachment, beat the butter on medium speed for 1 minute until smooth.
- With the mixer on low, gradually add the powdered sugar, meringue powder and salt, mixing to combine.
- Add the vanilla, and increase the speed to medium (#4-6 on a Kitchen Aid mixer); whip for 4-5 minutes until very light and fluffy, scraping the bowl down occasionally, and only adding the milk if needed for desired consistency.Turn the speed down to "stir" and mix for 2 minutes to eliminate big air bubbles.
- Remove the cooled cakes from the pans. Place one cake layer on a cake board, and frost with a layer of buttercream. Repeat stacking and filling the cake layers, then frost all over with a thin "crumb coat" of buttercream. Refrigerate for 30 minutes to set the crumb coat. Keep the bowl of remaining buttercream covered. Frost all over with a final, swirly layer of buttercream, or leave the cake as is for a semi-naked frosted cake.
Notes
Leftover cake should be stored in an airtight container or cake carrier at room temperature for up to 3 days.
For the super dark chocolate cake pictured in today's post, replace 2 tablespoons of your favorite Dutch-processed cocoa powder with black cocoa powder. This will give it a rich, dark color and a flavor similar to Oreo cookies.
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