excellent dessert with no oven, no whipping cream , no gelatin, no flour, no eggs! drives me crazy!

excellent dessert with no oven, no whipping cream , no gelatin, no flour, no eggs! drives me crazy ! ingredients : first layer: 200g of biscuits (any type you want) 2 tbsp of cocoa powder (15g) (optional) 1/4 cup of melted butter (50g) second layer : 4 cups of milk (1 liter) pudding powder for 1 liter of milk preparation caramel sauce (if your pudding powder is unsweetened, add 2-3 tbsp of sugar) 1 tbsp of liquid vanilla (optional) 5 tbsp of cornstarch (40g)