Cooked - Retro Chocolate Cake - New Recipe

Adjust oven rack to middle position and preheat oven to 350°F (175°C). Grease a 9- by 13-inch baking pan with nonstick spray and dust with flour.Sift flour and cocoa powder into a large bowl. Add sugar, baking powder, baking soda, and salt; whisk to combine.In another bowl, whisk coffee, mayonnaise, and vanilla extract until well combined. Add dry ingredients and whisk until just combined.Scrape batter into prepared pan. Bake until a cake tester comes out clean, about 35 to 38 minutes. Allow to cool completely on a wire rack.For the frosting, beat butter until creamy. Add confectioners' sugar, cocoa powder, milk, and vanilla extract. Mix until smooth and fluffy.Spread frosting over cooled cake. Slice and serve.