Chocolate Orange Cake

Preheat oven to 350°F (175°C). Grease cake pans.
Whisk dry ingredients: Combine flour, cocoa, sugar, baking powder, and salt.
Prepare batter: Mix eggs, oil, orange juice, vanilla, and zest. Stir into dry ingredients.
Bake cake: Pour into pans and bake for 30-35 minutes. Cool.