Food & Cooking Recipes Dessert & Treats Recipes Cake Recipes One Bowl Chocolate Birthday Cake 3.3 (178) 17 Reviews By Martha Stewart Editors Martha Stewart Editors Facebook Instagram Twitter Website An article attributed to "Martha Stewart Editors" indicates when several writers and editors have contributed to an article over the years. These collaborations allow us to provide you with the most accurate, up-to-date, and comprehensive information available.The Martha Stewart team aims to teach and inspire readers daily with tested-until-perfected recipes, creative DIY projects, and elevated home and entertaining ideas. They are experts in their fields who research, create, and test the best ways to help readers design the life they want. The joy is in the doing. Editorial Guidelines Updated on July 27, 2020 Print Share Share Tweet Pin Email Yield: Makes three 8-inch round layers, two 9-inch round layers, one 9-by-13 inch sheet or 3 to 4 dozen cupcakes This recipe calls for mixing all the ingredients together into a bowl, then dividing the batter into cake pans, then baking them. How easy is that? Ingredients Unsalted butter, for pans 1 ½ cups unsweetened cocoa powder, plus more for pans 3 cups all-purpose flour 3 cups sugar 1 tablespoon baking soda 1 ½ teaspoons baking powder 1 ½ teaspoons salt 3 large eggs 1 ½ cups buttermilk ¾ cup vegetable oil 1 ½ teaspoons pure vanilla extract Chocolate Frosting for One-Bowl Chocolate Cake Directions Preheat oven to 350 degrees. Butter round or square cake pans, and line bottoms with parchment; butter parchment, and dust with cocoa. Into the bowl of an electric mixer fitted with the paddle attachment, sift cocoa, flour, sugar, baking soda, baking powder, and salt. With the mixer on low, stir in eggs, 1 1/2 cups warm water, buttermilk, vegetable oil, and vanilla until smooth, about 3 minutes. Divide batter among prepared pans. Bake, rotating once, until tester inserted in center comes out clean, 35 to 45 minutes for 8-inch layers, depending on amount of batter. Let cakes cool in pans on a wire rack for 20 minutes, then remove from pans and cool completely, right side up on rack. Print