If you're new to vegan life, the easiest way to transition your kids to vegan school lunches, is by veganizing (make a vegan version) some of the meals they're already enjoying.
Think about it like this.... if your kids love turkey sandwiches - start experimenting with vegan deli slices (I like the Field Roast brand) and use vegan mayo (Just Mayo is a good brand), lettuce, tomato & mustard to make their favorite sandwich vegan. Also, check the ingredients on the bread to ensure that it's vegan (no milk, eggs or butter).
Try not to overthink it. You want to keep weekly lunches simple for you and delicious for them. :-)
I have an easy formula for making simple and delicious daily lunches....
Main entree + Fruit/Vegetable + Treat/Junk Food + Drink = Vegan School Lunch
I talk about making school lunches and even show you how I put one together for my boys in this video...
Main entree - sandwich (peanut butter and jelly is a great option), burrito, taco, wrap (one with hummus, red bell pepper, lettuce & tomato is an easy option) or leftover soup from dinner in a Thermos
Fruit and/or Vegetable - any whole fruit that you have on hand - berries, banana, apple, pineapple, etc. Mini salads with lettuce, tomato, carrot & cucumber served with balsamic vinaigrette or any vegetable and hummus. If you have older kids, a fruit and vegetable is probably a good idea because they eat more. Smaller kids should get one or the other so they don't waste food.
Treat/Junk Food - Don't skip out on the treat because kids love trading snacks! I know I used to back in the day. Plus, I think it's important for some of their food to look familiar.
Vegan junk food options mentioned in the video: Oreos, plain Lay's potato chips Earth Balance vegan cheddar popcorn, Late July chips (not all of their products are vegan; check the ingredients)
Clif Bar (not all of their products are vegan; check the ingredients) and Stacy's pita chips (not sure if all of their products are vegan; check the ingredients)
There are so many healthy junk food options out there! You can also check out PETA's accidental vegan list for some familiar (not healthy) snack options
Drink - Water is best but I used to give my boys an organic juice box one week out of the week. You can also send your kids to school with almond or coconut milk (they even sell chocolate flavored versions of these) in a Thermos or drink box.
Remember to keep it simple, get the kids involved and have fun!!