For the Chicken Marinade

• 2 large chicken breasts or 4 chicken thighs
• 1 cup Greek yogurt
• 1 tbsp lemon juice
• 1 tbsp ginger-garlic paste
• 1 tsp turmeric
• 1 tsp garam masala
• 1 tsp ground cumin
• 1 tsp ground coriander
• 1 tsp smoked paprika
• ½ tsp chili powder
• 1 tsp salt
• 1 tbsp oil

For the Masala Sauce

• 2 tbsp butter or ghee
• 1 tbsp oil
• 1 large onion, finely chopped
• 2 cloves garlic, minced
• 1-inch ginger, grated
• 1 tsp ground cumin
• 1 tsp ground coriander
• 1 tsp garam masala
• ½ tsp turmeric
• ½ tsp smoked paprika
• 1 tsp chili powder
• 2 tbsp tomato paste
• 1 can (14 oz) crushed tomatoes
• 1 cup heavy cream or coconut milk
• 1 tsp sugar (optional)
• Salt and pepper, to taste
• ¼ cup chopped cilantro (for garnish)
• 1 tbsp lemon juice (for finishing)