Puree half of the mango and chop the other half into small cubes.
Mix a teaspoon of the pureed mango with a tablespoon of yogurt until creamy. Keep some puree on the side.
Layer the trifle into a cup: a layer of plain yogurt, then a layer of pureed mango, then a layer of the mango/yogurt puree then more plain yogurt. Top with the chopped mango and granola.