Indian Butter Chicken

Name: Indian Butter Chicken
Ingredients: 1 c. Greek yogurt; Juice of 1/2 a lemon; 1 tsp. ground turmeric; 2 tsp. garam masala, divided; 1 tsp. ground cumin; 1 1/2 lb. boneless skinless chicken breast, cut into 1 pieces; 6 tbsp. butter, divided; 1 large onion, sliced; 2 jalapeños, minced; 1 cinnamon stick; 3 cloves garlic, minced; 1 tbsp. freshly grated ginger; 1 tsp. paprika; 1 (28-oz.) can diced tomatoes; 1/2 c. heavy cream; Freshly chopped cilantro, for garnish; Cooked basmati rice, for serving; Naan, for serving