Weeknight Tandoori Chicken

Name: Weeknight Tandoori Chicken
Ingredients: 1 1/2 teaspoons garlic powder; 1 1/2 teaspoons ground coriander; 1 1/2 teaspoons ground cumin; 1 teaspoon ground ginger; 1 teaspoon salt; 1/2 teaspoon cayenne pepper; 1 1/2 pounds boneless skinless chicken thighs; 1 tablespoon olive oil (or coconut oil); 1 (13-ounce) can coconut milk; 1 (8-ounce) can tomato sauce; 2 ounces fresh spinach (about 2 to 2 1/2 cups); 6 servings brown rice, cooked according to package directions; Suggested accompaniments: Cilantro, mint leaves, and plain yogurt