The girls can not take peanutbutter, or nut products either. We also don't eat processed meats (well, very rarely when we have a guest that lives off of them). I have found that leftovers work great. If they ate it for dinner they will not be picky about it for lunch. Sometimes meals are good cold and they like them cold.
I will make soups and put them in a thermos. Here's a couple really easy ones. I make this the night before and find the egg noodles stand up great.
Chicken noodle soup
saute onion, diced carrot, diced celery in a little oil and butter (this gives it more flavor) until they become glossy. Season with salt and pepper and a little poultry seasoning. Add home made chicken stock (tetra if not) and let simmer until the veggies are tender. Add some egg noodles and cook until firm yet tender. Check for seasonings.
Butternut squash soup (I use pureed squash I have frozen, you could use canned or fresh. If fresh just dice and add with the apples)
saute onion in a little oil and butter until soft. Season with salt and pepper and a pinch of nutmeg. Add a diced apple or a couple of pears, pealed and warm. Add some butternut squash, chicken stock and a little apple juice. Simmer until the apples are tender. Puree with a hand blender. Add some milk or cream in desired. Check seasoning.
I will make a quinoa or rice salad with a little olive oil, salt, pepper, red wine vinegar and whatever veggies I want. Or an Asian noodle salad using spaghetti, shredded carrot and and asian marinade.
Sunflower seed butter is a favorite of my oldest.
I will send tuna in a seperate container along with some crackers and they build their own tuna crackers. Tuna get soggy if it's made into a sandwhich ahead of time.
Cheese and crackers.
Lots of cut up veggies and fruits. Homemade muffins or quick breads. Homemade cookies every blue moon.