2 tablespoons cooking oil
1 onion, chopped
3 cloves garlic, chopped
1 tablespoon chopped fresh ginger
1 tablespoon ground cumin
1 tablespoon ground coriander
1/2 teaspoon turmeric
1/2 teaspoon paprika
1 1/2 teaspoons salt
2 jalapeño peppers, seeds and ribs removed, minced
1/2 cup canned crushed tomatoes, drained
1/2 cup heavy cream
1 cinnamon stick
1 1/2 cups water
2 10-ounce packages frozen chopped spinach, thawed
4 boneless, skinless chicken breasts (about 1 1/3 pounds in all), cut into 3 pieces each