Step 1

Preheat the oven to 350°F. Center an oven rack in the middle position. Line the bottom of 2 9-inch round cake pans with parchment paper. Lightly spray with nonstick cooking spray.

Step 2

In a large bowl, sift the flour, sugar, cocoa, baking soda, and salt.

Step 3

Using a handheld mixer or whisk, mix in the water, buttermilk, oil, eggs, and vanilla until well combined. Spread the batter evenly between the pans.

Step 4

Bake 28 to 35 minutes, or until a toothpick inserted in the center comes out clean or with moist crumbs. Let cool 2 to 3 minutes before running a knife around the edges and turning out onto a cooling rack. Let cool completely.

Step 5

On a cake stand or serving platter, place 1 cake layer. Spread the frosting evenly over the top. Place second layer on top and spread remaining frosting all over the top and sides. Refrigerate at least 30 to 60 minutes before slicing. Enjoy with a cold glass of milk!