Easy Butter Chicken

Ingredients

• 2 lb boneless, skinless chicken breast, cubed
• salt, to taste
• pepper, to taste
• 2 teaspoons chili powder, divided
• ½ teaspoon turmeric
• 6 tablespoons unsalted butter, divided
• 1 ½ cups diced yellow onion
• 3 teaspoons garam masala
• 1 teaspoon ground cumin
• 1 teaspoon cayenne pepper
• 1 tablespoon grated ginger
• 3 cloves garlic, minced
• 1 3-inch cinnamon stick
• 14 oz tomato sauce
• 1 cup water
• 1 cup heavy cream
• cooked rice, for serving
• chopped fresh cilantro, for garnish