The easy way is to buy a package that is all egg whites for this sort of thing. I see them at costco, and then you don't have to worry about the problem.
However, you probably already have them.
Here are a few ideas:
Do you have dry hair? Try beating 2 egg yolks and adding a bit of olive oil. Rub into your hair and leave for 20 minutes.
Do you have a dog or cat? I've yet to see one that didn't like eggs yolks and it makes their fur shiny.
You might try making lemon curd...
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