Chocolate cake: the old-fashioned recipe for ultra-moist, melt-in-your-mouth slices

When my husband asked for the chocolate cake his mother used to bake, I agreed with a mix of excitement and pressure. I had never tried a mayonnaise-based chocolate cake before, and serving it to family felt like stepping into the ring. The result surprised us: a deeply chocolatey, ultra-moist layer cake with a silky buttercream that disappeared on first bite.

Why this old-fashioned chocolate cake is worth trying

This cake borrows a humble trick from classic home baking: mayonnaise replaces oil. The texture becomes remarkably tender and moist. If you don’t know mayo is in the batter, you’d never guess. The cake is rich without tasting heavy.

Perfect for birthdays and family gatherings, it pairs a sturdy crumb with a luxurious chocolate frosting. It’s one of those recipes that looks impressive but is surprisingly forgiving.

Quick facts: time, yield, and oven basics

• Prep time: about 35 minutes
• Cook time: 35–40 minutes, depending on pan size
• Total time: roughly 1 hour 25 minutes
• Yield: about 12 slices
• Recommended pans: two 9-inch round pans (2.5-inch deep) or three 8-inch pans

Ingredients for a deeply chocolate, moist cake

For the cake batter

• 2 oz semisweet chocolate, chopped
• 2/3 cup unsweetened cocoa powder
• 1 3/4 cups boiling water
• 2 3/4 cups all-purpose flour
• 1/4 teaspoon baking powder
• 1 1/4 teaspoons baking soda
• Dash of salt
• 1 cup granulated sugar
• 1 cup packed light or dark brown sugar
• 2 large eggs
• 1 1/3 cups mayonnaise (not reduced-fat)
• 1 teaspoon vanilla extract

For the chocolate buttercream

• 10 oz semisweet chocolate, chopped
• 1 1/2 cups unsalted butter, softened
• 3 cups powdered sugar, sifted
• 1 tablespoon vanilla extract
• 1–2 tablespoons milk, if needed

How to bake the layers: step-by-step

1. Preheat the oven to 350°F. Grease and line two 9-inch pans or three 8-inch pans with parchment circles.
2. Whisk together flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
3. Place cocoa and chopped chocolate in a heatproof bowl. Pour in the boiling water and stir until smooth.
4. In a large bowl, combine both sugars and mayonnaise. Beat until homogenous.
5. Add eggs one at a time, mixing after each addition. Stir in vanilla.
6. Alternate adding the flour mixture (in four parts) with the chocolate mixture (in three parts), starting and ending with flour. Mix until just combined.
7. Divide batter between prepared pans. Bake until a toothpick inserted in the center comes out clean: about 35–40 minutes for 9-inch pans, 30–32 minutes for 8-inch pans.
8. Cool in pans 15–20 minutes. Run a knife around the edges, invert onto racks, and cool completely before frosting.

Make the chocolate buttercream

1. Melt the chopped chocolate and let it cool slightly but not harden.
2. Beat the softened butter until smooth and creamy.
3. Add sifted powdered sugar gradually and mix until combined. Stir in vanilla.
4. Pour in the melted chocolate and beat until the frosting is glossy and smooth.
5. If the frosting is too stiff, add 1 tablespoon milk at a time until spreadable.

Assembly and portioning tips

• Place one cake layer on your serving plate. Spread about ¾ cup frosting per layer for 8-inch cakes, or 1–1½ cups for 9-inch layers.
• Stack layers and finish by covering the top and sides with the remaining buttercream.
• Chill briefly if you prefer cleaner slices when serving.

Practical baking tips and common questions

• Do not overbake. Overbaking dries the crumb. Check early and watch closely near the end time.
• Use full-fat mayonnaise only. Low-fat versions alter texture and flavor.
• Swap semisweet for bittersweet chocolate if you prefer deeper cocoa notes. Avoid very high-cacao chocolate.
• If your frosting separates, chill the bowl briefly, then rewhip until smooth.
• To speed cooling, place pans on a wire rack in a cool area, not in the refrigerator.

Similar Posts:

• Banana cake with cream cheese frosting: moist, irresistible recipe
• White chocolate cranberry cheesecake: decadent holiday cake recipe
• carrot cake poke cake recipe: ridiculously moist, impressively easy
• Chocolate toffee cake for Christmas: irresistible holiday dessert
• Hershey’s chocolate cheesecake cake: the decadent dessert you didn’t know you needed

Dr. Elise Monroe

Health advocate and wellness researcher, Dr. Monroe brings clarity to confusing health trends with science-backed advice. Her mission is to help readers live vibrantly, from the inside out.