Peel the mango and dice the pulp. Wash, core and dice the apple. Put the mango, apple and coconut milk in an ovenproof dish. I always use flat crème brûlée forms for this.
Mix all ingredients for the crumble with the perforated spoon. Preheat the oven to 200 degrees U / O heat.
Pour the streusel over the fruit. Bake in the small tins for 20 minutes or in a large tin for about 40 minutes.