I don't want to accommodate my friend's food allergy anymore.
Why would you do that?
Because I don't like the extra work involved.
I understand the extra effort feels burdensome, but ignoring a person's food allergies when you're preparing meals for them is unconscionable. Are you aware that they could suffer a fatal reaction?
No one has been hurt yet, so why should I worry?
It's likely no one's been harmed yet because you've always taken it seriously. It's not okay to ignore a food allergy and hope for the best. Your friend will be upset.