Paris restaurant recommendations for teens who are not very adventurous eaters

[Kilpitlees]

Bit of a parenting fail, but I have two older teens who are not exactly gastronomes. We are heading to Paris for 5 days over the summer, so I am looking for restaurant recommendations for those with a less adventurous palate.
I will try and up my parenting game but persuading the boys out of trainers may also be a hard task, so recommendations for casual eating places would also be appreciated.
Food markets like Time Out in Brooklyn were a hit due to the pick and mix options.
Hoping someone can help. Thank you

Second the suggestion for Breizh cafe. My picky eater was also a fan of the ham and cheese baguettes - we stopped at various bakeries for lunch and that that worked well, especially if they're really hungry! And since you're staying in the 9th, Kozy Montmarte was great for brunch- probably my kids favorite meal.

We had a good lunch at Brasserie Martin after a visit to the Ateliere Lumiere, a couple of years ago. It was simple brasserie food, cooked very well, think sausage with incredibly indulgent mash, roast chicken with chips. It’s part of a small chain: https://lanouvellegarde.com/en/brasserie-martin/. Lots of bakeries in France sell wonderful sandwiches and boxed salads now, you could grab a bagful of those and head to the Seine or a park for a no-fuss lunch. Plus, try the ‘Brets’ brand of crisps, they have a real range of flavours - from Camembert to teriyaki - all very nice and fun flavours to try.