The phrase "what cookings" is an informal way of asking what's cooking or what's being preparing for a meal. There are several synonyms that can be used instead of "what cookings" such as "what's on the menu," "what's for dinner," "what are you cooking," "what's in the pot," or "what's in store for us tonight." These phrases are more formal and commonly used when asking about a specific meal or dish. It's important to note that the choice of words used to ask about food preparation depends on the context, tone, and relationship between the speaker and listener.