To prepare a tiramisu chocolate mousse recipe, first you need to prepare the ingredients. First, you'll need the following ingredients: 1 cup (240 ml) chocolate granulated sugar 1 tablespoon (25 g) cocoa powder 1 teaspoon vanilla extract 1 tbsp. milk Instructions Preheat the oven to 375 ?F (191 oC) and grease and flour two 8-inch (22-centimeter) round cake pans. Set aside. In the bowl of an electric mixer fitted with the whisk attachment, beat the egg whites on medium speed until stiff peaks form. Gradually add the confectioners' sugar, beating well after each addition. Sift the flour into the chocolate mixture and beat until the mixture is stiff and glossy, about 2 minutes. Beat in the vanilla and chocolate chips until combined. Pour the batter into prepared pan and spread evenly. Bake the cake for 35 to 40 minutes, or until toothpick inserted in center comes out clean. Allow to cool before removing from the pan. Serve warm or at room temperature.