Preheat oven to 350°F. Grease and flour the edges of two 8-inch baking pans, shaking out the excess. Line the bottoms with cut-to-shape parchment paper. Divide the batter evenly between the two pans. Bake at 350°F for 20-25 min, or until done. Cool in the pans for 15 min. Invert onto wire rack, and cool completely. Remove parchment paper.
In a large bowl combine the flour, sugar, cocoa powder, baking soda, baking powder, and salt.
Add the vegetable oil, buttermilk, coffee, eggs, and vanilla to the bowl and mix with electric mixer on low speed until well blended and completely incorporated.