Yea we do leftovers a lot. I am starting to try to do a protein at every meal, but I don't always, sometimes just fruit and veggies and pasta or cereal. She likes the yogurt smoothies I just put a straw in the container. We have done eggs (hard boiled or scrambled), but depends on your allergy situation. We do oatmeal a lot for breakfast, I have the quick oats and I make with half water half apple juice, she loves it and even likes it cold as leftovers (it is semi solid and she can pick up). Pasta is also good, I just cook in water but my sister cooks in chicken broth for my niece for a little more nutrition. Also, edamame I buy frozen shelled and can cook as little as I want at a time.
As for regular fruits and veggies I have had success, some are not in season now but I will list anyway, avacado, melon, ripe peaches, ripe plums, bananas, peas, zucchini, yellow squash, sweet potato, and blueberries. Also, I will buy the fruit cups in juice or water I have given her peaches and pears that way.