Combine chicken, onions, tomato paste, garlic paste, ginger paste, butter, blended tomatoes, and sugar/sweetener in the slow cooker.
Add the spice blend (paprika, chili powder, curry powder, cumin, salt, pepper).
Cook on High for 2-3 hours or Low for 3-4 hours.
Cook pasta to 50% of box time.
In a separate bowl, combine Greek yogurt, cream cheese, and garam masala.
Once chicken is cooked, shred it.
Add cooked pasta, pasta water, and the Greek yogurt mixture to the slow cooker with the chicken.
Stir in cheddar and mozzarella cheese until melted.
Top with chopped cilantro and green onions.
