Pudding and mousse both have similar ingredients. You start with sugar, chocolate, eggs, and cream or milk. The main difference between chocolate mousse and chocolate pudding is that traditionally, pudding is cooked, and mousse is not cooked. Pudding is thickened over heat with the help of corn starch. This method of cooking creates a dense, creamy texture. In contrast, a mousse dessert recipe is not cooked. Melted chocolate is combined with raw egg yolks, and then extra fluffiness is added by folding in whipped egg whites and fluffy whipped cream. The textures of pudding vs. mousse s also very different. Pudding is rich, thick, and creamy. It has a denser texture. Mousse is light and fluffy and has a very creamy texture.