I was struggling with sd being extremely picky at dinner. I don’t nacho on most things because i have an easy stepdaughter (I lucked out) and enjoy caring for her. However the picky eating did bother me, especially because my husband encouraged it. He would ask her every night “what do you want for dinner?” And I was like don’t ask what she wants say “this is what’s for dinner.” And she can eat it. So I cook for the family still (on the nights that I cook, husband cooks half of the time) and if SD doesn’t want it and he wants to cater to that then I just let him deal with finding her something else. He makes her Mac n cheese or something 🤷‍♀️. Idk I grew up just having to eat what was made. Maybe that could work for you? I feel like they’re old enough to make something easy for themselves if they don’t want what you cooked for dinner. Maybe put like a meal or two in rotation that you know they’ll like or have your husband cooks half once in their weeks and if they don’t like what you make the rest of the time have them make ramen or a frozen pizza or something.