Gently melt your milk chocolate over a double … To make this cake … Dust the pan with flour and tap out the excess. This cake is for anyone who loves a good Twix candy bar. 7) Milk chocolate mousse (prepared in exactly the same way as the dark chocolate mousse): Bloom gelatine by mixing in 1.5 tablespoons of water.Set aside. Make the chocolate génoise: 1. Butter a 9-inch round cake pan. Preparation. Preheat the oven to 350°F. This cake consists of a cookie base, which gives a lovely crunch to the cake, a soft caramel ganache, an amazing milk chocolate mousse and lastly topped off with a milk chocolate glaze.