• Preheat the oven to 375 degrees and lightly spray the donut pan with nonstick cooking spray.
• Sift 1 ½ cups of flour into a mixing bowl. If you don't have a sifter, most flour has been pre-sifted but still has some lumps that you will need to throw out.
• Add sugar, salt, baking soda, baking powder, and cocoa to the flour. Then, give everything a stir so the dry ingredients are mixed together. 
• Add the egg, vegetable oil, and buttermilk and mix until lump-free. The donut batter will be thick. 
• Gently spoon the batter into the donut pan. Fill each donut about halfway full.
• Place the donut pan on a cookie sheet, you don't have to do this but we do to prevent oven spills.
• Bake at 375 for 8 to 9 minutes. After baking, let them cool for about 5 minutes and then transfer them to a cooling rack for about 30 minutes. This will allow them to completely cool so that you can glaze them.

Chocolate Glaze

• Pour 1 cup of powdered sugar into a mixing bowl.
• Add vanilla, cocoa and 1 tablespoon of heavy cream to the powdered sugar.
• Begin mixing until the glaze is smooth. You can add more heavy cream if needed to achieve the desired consistency.
• Dip the donuts into the glaze and immediately move to a cooling rack to allow the glaze to dry.