Crackers and cheese - surprisingly filling even for adults
Pasta salad - veggie can be roasted red pepper, or broccoli, or lightly sautéed cauliflower. An Italian vinaigrette sauce/dressing with a little Parmesan. Easier than it sounds
Pizza bites from the frozen section
Grilled cheese sandwiches
Add fruit & veggie to the cracker/pizza/sandwich lunches.
choose from: grapes, carrots, sugar snap peas, apples, strawberries, watermelon, cucumber.