My kids get a multi vitamin as well. Muffins with carrot or zucchini
in it can pass unnoticed. Sometimes when you do fun things like make cucumber o's or give them something like a little ranch dressing to dip in, they will think it is fun to eat vegis again.
From 2 to about 4, my non sensory kid stopped eating his vegis. He came back to his senses and eats broccoli, aspargus, spinach, carrots, mushrooms, peppers, etc. He definately went through a phase where he wouldn't eat it.