In bowl,add yogurt,ginger garlic paste,tandoori masala,cooking oil and whisk well.
Add mutton shank and mix well,cover and marinate for 4-6 hour in refrigerator.
On aluminum foil,place marinated mutton pieces with remaining marinade and fold all edges.
On baking tray,place folded aluminum foil pieces and bake in preheated oven at 150 C for 1 hour.
Take out from oven,open the foil and again bake uncovered in preheated oven at 180 C for 25-30 minutes.