Step 1

Preheat oven to 350°F, and grease a 9-inch round cake pan.

Step 2

Combine sugar, flour and cocoa in a large bowl. Stir in baking soda and salt.

Step 3

Whisk in oil, vanilla and vinegar, and add water and mix until batter is smooth.

Step 4

Pour batter into prepared pan. Bake 30 to 35 minutes until center is done and toothpick comes out clean.

Step 5

Prepare optional glaze: Mix butter with 2 1/2 cups powdered sugar until creamy. Add vanilla and cocoa. Stir in 1/3 cup water until smooth. Mix in additional water for thinner frosting, or use more sugar to thicken the mixture. Cover and refrigerate until needed.

Step 6

Allow cake to cool completely before frostng or serving. Enjoy!