Yes. Cashews can be skipped with almonds in paneer butter masala. Cashews give thickness and a milky flavor to the gravy. This can be attained by using almonds too. Just soak them in hot water for about 30 minutes, peel the skin, grind them to form a smooth paste, and add them to the gravy. As they give a sweet and rich flavor to the gravy, do not skip them. you can also add a combination of both.