Chocolate Mousse

1 tablespoon unsweetened cocoa powder, or as needed 1 (18.25 ounce) package devil's food cake mix 1 1/4 cups water 1/3 cup vegetable oil 3 eggs 2 (1 ounce)[...]

1 cup white sugar 2 cups butter 1 cup water 1 teaspoon instant coffee granules (optional) 1 pound semisweet chocolate, chopped 8 eggs 1/2 cup heavy whipping[...]

1 1/2 cups all-purpose flour 1 cup white sugar 1/4 cup unsweetened cocoa powder 1/4 teaspoon salt 1 cup hot, brewed coffee 1/3 cup vegetable oil 1 tablespoon[...]

1 tablespoon unsweetened cocoa powder, or as needed 1 (18.25 ounce) package devil's food cake mix 1 1/4 cups water 1/3 cup vegetable oil 3 eggs 2 (1 ounce)[...]

1 (18.25 ounce) package chocolate cake mix 1 (14 ounce) can sweetened condensed milk 2 (1 ounce) squares unsweetened chocolate, melted 1/2 cup cold water 1[...]