In a pan cook the apples, 2 tbsp. sugar, pinch of cardamom powder and 1/4 cup water for 2-3 minutes or till the apples turns slightly soft.
In a bowl, mix together whole wheat flour, roasted oats, remaining sugar, remaining cardamom powder and butter with your fingertips till they resemble bread crumbs.
Add the cooked apples in a baking dish and cover it with the crumbled flour-butter mix. Bake in a preheated oven at 180 degrees C. for 20-25 minutes till the surface turns slightly brown.
Garnish with the saffron and sliced apples. Serve this yummy dessert, hot, at room temperature or chilled.