Chicken in Indian Spiced Tomato Sauce

Name: Chicken in Indian Spiced Tomato Sauce
Ingredients: 3 tablespoons vegetable oil; 3 pounds boneless skinless chicken thighs; Salt and pepper; 1 medium onion, finely chopped; 4 cloves garlic, minced; 2 tablespoons ginger, peeled and minced; 2 tablespoons tomato paste; 2 teaspoons garam masala; 2 teaspoons ground cumin; 2 teaspoons ground turmeric; ½ teaspoon ground coriander; ¾ teaspoon cayenne pepper; ¾ teaspoon ground cardamom; 8 cups low-sodium chicken broth; ¾ cup canned tomato purée; ½ cup heavy cream; 1 pound small potatoes, cubed; Plain yogurt, for serving; Fresh mint, for serving,; Naan or rice, for serving