Butter Chicken

For the chicken marinade:

• 28 oz boneless and skinless chicken thighs or breasts cut into bite-sized pieces
• 1/2 cup plain yogurt
• 1 1/2 tablespoons minced garlic
• 1 tablespoon minced ginger
• 2 teaspoons garam masala
• 1 teaspoon turmeric
• 1 teaspoon ground cumin
• 1 teaspoon red chili powder

For the sauce:

• 2 tablespoons olive oil
• 1 tablespoon butter
• 1 large onion, sliced or chopped
• 1 1/2 tablespoons garlic, minced
• 1 tablespoon ginger, minced
• 1 1/2 teaspoons ground cumin
• 1 1/2 teaspoons garam masala
• 1 teaspoon ground coriander
• 14 oz crushed tomatoes
• 1 teaspoon red chili powder
• 1 1/14 teaspoon salt
• 1 cup heavy cream
• 1 tablespoon sugar
• 1/2 teaspoon kasoori methi