Mayonnaise replaces the oil that's typically used in chocolate cakes. It gives this cake—which would make the ideal birthday cake—an incredibly moist and tender texture. Serve with glasses of ice-cold milk. Ingredients cake 2 ounces bittersweet chocolate (do not exceed 61% cacao), chopped 2/3 cup unsweetened cocoa powder 1 3/4 cups boiling water 2 3/4 cups all purpose flour 1 1/4 teaspoons baking soda 1/4 teaspoon baking powder 1 cup sugar 1 cup (packed) dark brown sugar 1 1/3 cups mayonnaise (do not use reduced-fat or fat-free) 2 large eggs 1 teaspoon vanilla extract frosting 10 ounces bittersweet chocolate (do not exceed 61% cacao), chopped 1 1/2 cups (3 sticks) unsalted butter, room temperature 3 cups powdered sugar 1 tablespoon vanilla extract special equipment Three 8-inch-diameter cake pans with 1 1/2-inch-high sides Preparation cake Preheat oven to 350°F. Butter and flour three 8-inch-diameter cake pans with 1 1/2-inch-high sides.
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