Pre-heat oven to 350⁰F (180⁰C). Line bottom of a 13 x 9 inch (33 x 23 cm) rectangular metal baking pan with parchment paper. Grease sides with vegetable oil.
In a large bowl, using an electric mixer, combine flour, sugar, cocoa, baking powder, baking soda and salt; mix on low speed until combined.
Add eggs, buttermilk, oil and vanilla and beat on low speed for 1 minute, scraping bowl often. Then beat on medium speed for 2 minutes, scraping bowl occasionally.
Pour batter into prepared pan.
Bake for about 40 minutes or until a tester comes out clean. Let cool on wire rack for 10 minutes. Turn out onto rack and let cool completely.
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