For the cake:

• 2 cups all-purpose flour

• 2 cups granulated sugar

• ¾ cup unsweetened cocoa powder

• 2 teaspoons baking powder

• 1½ teaspoons baking soda

• 1 teaspoon salt

• 1 cup buttermilk, room temperature

• ½ cup vegetable oil

• 2 large eggs

• 2 teaspoons vanilla extract

• 1 cup hot water or hot coffee

For the frosting:

• 1 cup unsalted butter, softened

• 3–4 cups powdered sugar

• ½ cup unsweetened cocoa powder

• ¼ cup heavy cream or milk

• 2 teaspoons vanilla extract

For the ganache:

• ½ cup heavy cream

• 4 oz semi-sweet chocolate, chopped

Extras:

• 1 cup chocolate chips or chunks

• Sprinkles or crushed nuts (optional)