Most "picky eaters" were made that way at home
I grew up in a house where dinner was dinner. You ate what was in front of you or you went to bed hungry, and nobody sat down to negotiate with a 6 year old about broccoli.
Now I have friends cooking three separate meals every night because one kid only eats beige food and the other one "doesn't do sauce". Then they tell me that's just how he is, like it arrived with him. He is SEVEN. He did not come out of the womb with opinions about pesto.
Before anyone starts, yes, ARFID is real and sensory stuff is real and if your kid has an actual diagnosis then obviously none of this is aimed at you. My cousin has a boy who genuinely cannot handle anything wet and they have been working with a feeding therapist for 2 years. That is a different thing and everyone knows it is.
I'm talking about the kids who eat everything at their grandmother's house and then get home and suddenly can't. That is not a palate. That is a kid who worked out that holding out for 20 minutes gets him chicken nuggets, because it does, every damn time.
You are allowed to just make one dinner.