Ingredients

Vegetable-oil cooking spray 

3/4 cup unsweetened cocoa powder 

1 1/2 cups all-purpose flour 

1 1/2 cups sugar 

1 1/2 teaspoons baking soda 

3/4 teaspoon baking powder 

3/4 teaspoon salt 

2 large eggs 

3/4 cup warm water, about 110 degrees 

3/4 cup buttermilk 

3 tablespoons vegetable oil 

1 teaspoon pure vanilla extract 

Preparation

Preheat oven to 350 degrees. Coat a large 12-cup muffin tin with cooking spray. Sift cocoa, flour, sugar, baking soda, baking powder, and salt into large bowl. Stir in eggs, water, buttermilk, oil, and vanilla until smooth, about 3 minutes.

Spoon batter into cups. Bake until cake tester comes out clean, 20 to 25 minutes. Let cool in tin 10 minutes. Unmold; let cool completely on wire racks.