Dole has produced a Healthy Eating Toolkit to promote healthy eating at school and home. Though not vegetarian, there can be some helpful ideas. See:
https://www.actionforhealthykids.org/nutrition-toolkit/
Here’s a recipe for breakfast taco with quinoa and kale: https://www.actionforhealthykids.org/protein-packed-breakfast-tacos/
For other school ideas, see:
https://www.vrg.org/fsupdate/index.htm
https://www.facebook.com/groups/VRGparentsandkids/ (VRG Parents Group)