Preheat your oven to 180c to roast the Muesli for 5 minutes. Set it aside to cool.
Start with a spoonful of Greek yogurt, then add muesli, then a spoon of marmalade, work your up to the rim of the cup, and top with muesli. Or start with the roasted muesli and continue to layer with yogurt, marmalade, and muesli until you reach the top of the cup.