Here are a few recipes you could try. I found them while looking for ideas for my own kids. I haven't tried them yet, but I plan to soon.
Cheesy Alphabet Pasta
1 box of alphabet pasta, cooked and drained
1 bag of shredded cheddar cheese
1 bag of frozen peas and carrots, thawed
1 small package of chicken tenders, , and cut into chunks
Mix it all together while pasta is hot, then put into portion-sized containers to freeze.
Beef broccoli and cheese croissant:
package Pillsbury croissants
broccoli cut into small pieces
Roll out the croissants side by side (squishing the dough together) in a baking dish. In the center add the fully cooked seasoned meat (salt & pepper if you like), shredded cheese and broccoli. Fold the side into the center connecting them. You can be messy with it as long as most of it is attached at the top. Bake until golden brown at about 375. I think it takes like 1/2 hour. Cut and serve.
Tortilla roll ups:
Cream Cheese/love the veggie kind
Spread cream cheese evenly on the tortilla then layer. Roll it up and cut into pieces... for the little kids I just cut everything into little pieces and let them pick at it.
My daughter is a picky eater, but soup is one thing she likes. I buy her the Campbells Dora and Alphabet soups, and she likes soup that I make at home too. You might also try some of the Gerber Graduates meals. They're made for kids, so they might be a little lower sodium than the regular spaghetti-O's and things like that. Good luck! I know how frustrating it is to have a picky eater.