1. Puree: Sauté onion, tomatoes, cashews, and cilantro stems in oil. Add spices, cook until soft, then blend. 2. Pasta: Cook pasta, saving 1/2 cup pasta water. 3. Chicken: Season chicken, air fry at 375°F for 18 mins. Cube and set aside. 4. Butter Sauce: Melt butter, add chili powders, kasuri methi, tomato puree, cream, and sugar. 5. Combine: Toss pasta, chicken, and reserved water into the sauce.