Chocolate Mousse without coffee liqueur chips

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 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[...]

6 ounces bittersweet chocolate, chopped 6 eggs, separated 6 teaspoons rum

1/2 cup chocolate cookie crumbs 1 pinch ground cinnamon 8 (1 ounce) squares semisweet chocolate 1 tablespoon butter 2 (8 ounce) packages cream cheese,[...]