Take all ingredients for chicken marinade except chicken in a bowl & whisk them to combine all the ingredients. Add chicken legs, toss it well in the marinade till chicken gets coated well.
4 chicken whole legs, 1/3 cup whisked curds, 1 tablespoon ginger garlic paste, 1 teaspoon spicy red chilli powder, 2 tablespoon kashmiri chilli powder, 1/2 teaspoon garam masala powder, 1 teaspoon salt, 2 1/2 teaspoon roasted & crushed kasuri methi, 4 teaspoons lemon juice, 2 tablespoons mustard oil