1 cup unsweetened cocoa
2 cups boiling water
1 cup butter, softened
2 1/2 cups sugar
2 1/2 cups all-purpose flour
1/2 teaspoon salt
2 teaspoons baking soda
1/2 teaspoon baking powder
Preheat oven at 350 degrees.
Mix cocoa in boiling water. Cool. Sift dry ingredients.
Beat soft butter with sugar. Add eggs one at the time. Add cocoa mix and flour mix to butter mixture.
Blend at low speed while alternating cocoa and flour. Mix until batter is smooth, scraping edges and bottom of bowl with a spatula.
Line the bottom of one 12-inch cake pan or 2 9-inch pans with parchment.
Grease and flour. Pour batter in mold. Bake 30 to 40 minutes until center is cooked. Cool 10 minutes. Unmold on a rack. Cut in layers.
Fill with the chocolate mousse filling recipe.