Slow Cooker Indian Butter Chicken

Name: Slow Cooker Indian Butter Chicken
Prep time: 20 min
Cook time: 5 h
Total time: 5 h 20 min
Cuisine: Indian
Ingredients: 1 cup plain yogurt; 1 tablespoon lemon juice; 2 teaspoons ground cumin; 1 teaspoon ground cinnamon; 1 teaspoon cayenne pepper; 3/4 teaspoons coarse ground black pepper; 1 teaspoon ground ginger; 1 teaspoon salt; 3 boneless skinless chicken breasts; 1 tablespoon butter; 1 clove garlic (, minced); 1 jalapeno pepper (, finely chopped); 2 teaspoons paprika; 1 teaspoon salt (, or to taste); 1 8-ounce can tomato sauce; 1 cup heavy cream; 2 tablespoons cornstarch; 1 tablespoon water; 1/4 cup fresh cilantro (, chopped )