Combine dry and liquid ingredients in separate bowls.
Add liquid to dry ingredients.
Mix until moistened.
Beat until smooth.
Pour into a greased and cocoa-dusted 9×13-inch pan.
Bake at 350°F for 35 to 40 minutes.
Dust with powdered sugar just before serving.
Glaze with Fudge Glaze, or frost with Whipped Cocoa Frosting.
For cupcakes, fill cups about ⅔ full and bake for 18 to 20 minutes.
For two layers, bake in two 9-inch round pans for 30 minutes.
For brownies, bake in two 9×13-inch pans for 20 to 25 minutes or in one 12×17 sheet pan for 22 minutes.
For loaf cakes, half fill 1 pound loaf pans and bake for about 24 minutes.
For solar oven method, bake in a solar box oven for 1-½ to 2 hours.
