Slow Cooker Chicken Tikka Masala

Name: Slow Cooker Chicken Tikka Masala
Ingredients: 2 pounds boneless, skinless chicken thighs, cut into 1-inch pieces; 1/2 cup whole-milk plain yogurt (not Greek); 1 1/2 teaspoons kosher salt, divided; 1 large yellow onion, diced; 3 cloves garlic, minced; 1 tablespoon peeled and minced fresh ginger; 2 teaspoons ground coriander; 2 teaspoons garam masala; 1 teaspoon ground cumin; 1 teaspoon ground turmeric; 2 tablespoons tomato paste; 1 (15-ounce) can diced tomatoes, drained; 3/4 cup heavy cream or coconut milk; Chopped fresh cilantro; Cooked rice or naan, for serving