If using heavy cream instead of cashews, add heavy cream at the end once the curry is done.
After the curry is done, if your sauce is too thick add some water and do saute mode for couple of minutes. If you sauce is too think then do saute mode till desired consistency is reached.
In the same sauce, any other vegetables, paneer or meat can be cooked. (adjust the cooking times as needed).
Vegans can skip ghee/butter and use vegan butter or olive oil.