Heat oil in a large deep skillet, over medium heat.
Add onion and garlic and sauté 1 minute. Add cumin, masala and curry powder and mix well, cooking 1 minute.
Place chicken in the pan and season with 1 teaspoon salt.
Add tomatoes, cilantro, coconut milk and water.
Stir all ingredients and cover pan, simmer on medium-low until chicken is cooked through, about 30 minutes.
Add potatoes, 1/2 teaspoon salt and simmer, covered an additional 10 minutes, or until the potatoes are tender.
Pressure Cooker Directions: Reduce water to 1/2 cup and cook the chicken after step 4 on high pressure for 15 minutes, quick release then add potatoes, high pressure 5 minutes. Let it release naturally.