For the Chicken:

• 1 1/2 lbs boneless, skinless chicken thighs or breasts (cut into bite-sized pieces)
• 1 cup buttermilk
• 1 teaspoon garlic powder
• 1 teaspoon paprika
• 1/2 teaspoon salt
• 1/2 teaspoon black pepper
• 1 cup all-purpose flour
• 1/2 cup cornstarch
• 1 teaspoon baking powder
• vegetable oil for frying

For the Sauce:

• 3 tablespoons unsalted butter
• 1 small onion (finely diced)
• 2 cloves garlic (minced)
• 1 tablespoon grated ginger
• 1 tablespoon tomato paste
• 1/2 cup tomato sauce
• 1 cup heavy cream
• 1 teaspoon garam masala
• 1/2 teaspoon ground cumin
• 1/2 teaspoon turmeric
• 1/4 teaspoon cayenne pepper (optional)
• salt to taste
• 1 tablespoon chopped cilantro (optional, for garnish)