Spread on top of the cooled cake, top with sprinkles (optional), serve immediately and enjoy! (makingthymeforhealth.com)
Let set for a couple minutes before pouring on top of cooled cake. (goldenbarrel.com)
spread the mousse on top of the cooled cake in the springform pan, and put it in the fridge to chill while you make the top layer. (withloveandcupcakes.com)