<human>:  What is a good recipe for a chocolate birthday cake?
<bot>: Preheat your oven to 350 degrees F (175 degrees C). 2 Grease and flour a 9x13-inch cake pan. 3 In a large bowl, mix together 3 cups all-purpose flour, 2 cups white sugar, 1 cup cocoa powder, 1 teaspoon baking soda and 1 teaspoon baking powder. 4 Add 1 cup vegetable oil, 2 cups water, 2 teaspoons vanilla extract and 2 tablespoons vinegar. Mix the ingredients together with an electric mixer until all ingredients are completely blended.5 Pour cake batter into the prepared baking pan and bake for 35 minutes, or until a toothpick inserted into the center of the cake comes out clean. 6 Allow the cake to cool completely before topping with your favorite icing or frosting. Enjoy!