Creating the Ultimate Authentic Butter Chicken is a straightforward process if you follow these simple steps:

1. Marinate the Chicken: In a bowl, mix the yogurt, lemon juice, garam masala, cumin, coriander, turmeric, chili powder, and salt. Add the chicken thighs, ensuring they are well coated. Cover and let marinate for at least 30 minutes (or overnight in the fridge for deeper flavor).

2. Cook the Chicken: In a large skillet or pan, heat 2 tablespoons of butter over medium heat. Add the marinated chicken pieces, cooking until browned on all sides. Remove from the pan and set aside.

3. Sauté Aromatics: In the same pan, add the remaining 2 tablespoons of butter. Once melted, add the chopped onion and sauté until golden brown, about 5-7 minutes. Stir in the minced garlic and grated ginger, cooking for another 1-2 minutes until fragrant.

4. Add Tomatoes: Pour the crushed tomatoes into the pan, stirring to combine. Let the mixture simmer for about 10 minutes until it thickens slightly.

5. Blend the Sauce: Using an immersion blender, blend the tomato mixture until smooth (or transfer to a blender and blend carefully). Return the sauce to the pan.

6. Add Cream and Chicken: Lower the heat and stir in the heavy cream. Add the browned chicken back into the sauce, stirring to coat. Let it simmer on low for an additional 10 minutes, allowing the flavors to meld.

7. Garnish and Serve: Remove from heat and garnish with fresh cilantro before serving.

Following these steps will guide you in creating this incredible dish effortlessly.