Heat 2 tablespoons of oil in a large skillet over medium-high heat until shimmering appears at the surface. Season chicken pieces generously with salt and black pepper, then sear for 3-4 minutes per side until golden brown. Work in batches if necessary—crowding the pan drops temperature and prevents proper browning. Transfer seared chicken to a plate and set aside.
Reduce heat to medium and add 2 tablespoons butter to the same skillet. Add diced onion and cook for 3 minutes, stirring frequently until edges begin softening. This builds flavor foundation through caramelization while the skillet's residual heat works with butter to create depth.
Stir in minced garlic and ginger, cooking for exactly 1 minute until fragrant but not browned. Add tomato paste and cook for 2 minutes, stirring constantly to develop rich, concentrated flavors that won't taste raw. This is where traditional cooking meets efficiency in your best butter chicken creamy recipe.
Sprinkle garam masala, paprika, cumin, and turmeric directly into the skillet, stirring for 30 seconds to bloom spices in the butter. Pour in chicken broth immediately, scraping any browned bits from the pan bottom. These fond particles contain concentrated flavor that must remain in the sauce.
Return seared chicken pieces to the skillet along with any accumulated juices. Bring the mixture to a gentle simmer and cook for 8-10 minutes until chicken reaches 165°F internally. The sauce should reduce slightly, concentrating flavors while the chicken finishes cooking through completely.
Remove from heat and stir in heavy cream and remaining 2 tablespoons butter until fully incorporated. The creamy chicken sauce will transform into silky, luxurious texture that coats each piece beautifully. Taste and adjust seasoning with additional salt and black pepper as needed for your preference.
Stir in fresh lemon juice and chopped cilantro just before serving for brightness and herbaceous contrast. Serve immediately over basmati rice or with naan bread for complete elegant dinner experience.