In a jug, whisk together the coconut milk, mango chutney, tomato puree, curry powder, cumin, ground coriander, salt, pepper, and chilli flakes (if using). Pour over the chicken and mix everything together with a wooden spoon.
400 ml Coconut Milk, 4 tablespoon Mango Chutney, 2 tablespoon Tomato Puree, 4 tablespoon Mild Curry Powder, 1 teaspoon Ground Cumin, 1 teaspoon Ground Coriander, 1 teaspoon Chilli Flakes, ½ teaspoon Salt, ¼ teaspoon Pepper