Spice Blend:

• 1 tablespoon melted coconut oil or olive oil
• 1 large yellow onion, finely diced (1–1/2 cups)
• 1 tablespoon ginger paste
• 1 tablespoon minced garlic
• 1–1/4 teaspoons smoked paprika
• 1–1/4 teaspoons ground cumin
• 1–1/4 teaspoons ground turmeric
• 1–1/4 teaspoons salt
• 2–1/4 teaspoons garam masala
• 1/8 teaspoon red pepper flakes (optional)
• 1 teaspoon sugar (optional)

Chicken and Sauce:

• 1 (14.5-ounce) can diced tomatoes or crushed
• 2 pounds boneless skinless chicken thighs
• 8 tablespoons unsalted butter, sliced into tablespoons
• 1/2 cup heavy cream
• 1/3 cup finely chopped cilantro (optional)
• Naan, warmed, for serving
• Cooked rice, for serving