It could mean a number of things. Can you please provide some context?

Unfortunately, I lost my recipe. But I found my notes on this topic and couldn't understand the meaning of this word. I thought that without the context it will be possible to understand. Thanks for answers!

Without context, I'd say it means "not cooking". I'm tired, rather than cook, let's pop out tonight and get some Italian food. . If you greese the tray adequately, the muffins will simply pop out without fuss when cooked. . pop out - release or leave easily, without effort, or to suddenly be exposed, out, even, not home.

In terms of cooking, it could mean a number of things i would hazard a guess if it was said by a northerner uk it could be used as |" take out" as in pop out of the oven = take out of the oven or pop in the oven =put in the oven. Perhaps if you give the sentence you have seen it in, it may help to clarify the meaning.