I make it just before sleeping and leave it overnight in the oven and take it out as soon as I wake up, it sets perfectly.
Its important to place small individual containers on a baking sheet(I used 2 sheets) and place on topmost rack. A large rectangular pan may be placed in the middle of the oven. No need to put on a baking sheet/tray. We are just trying to provide a warm oven for the mousse to set, not to bake it.
Keyword eggless mango mousse, mango mousse with yogurt, no agar agar mango mousse, no cook eggless mango mousse, no gelatin mango mousse