I want to take other people's published recipes and then make a video out of them. So, say I find a recipe on some food blog or a different YouTube video, I want to take the recipe and record my own video of me making it, and upload it to YouTube.
My understanding from the research I've done (see here and here) is that lists of ingredients are in the public domain (which I presume includes the amounts, and not just the ingredient names, but maybe I'm not understanding that properly), and while one may be able to copyright the instructions if they're significantly creative enough, it's unlikely, since that too is not creative enough to be warrant copyright protection.
Therefore, it seems safe legally to take someone else's recipe, even I were able to monetize the video, but is it plagiarism (not necessarily copyright) to not cite where I got the recipe from?
I'm also not asking about the real-word, "will they actually come after me," but rather the hypothetical, "could they." That is, would it technically be plagiarism, even if no one would want to take action against it.
Lastly, less of a legal question, is it conventionally understood to be unethical or just bad practice not to cite recipes, even if it isn't illegal?