What legumes can your husband eat?
BTW, the steamed spinach/super cheesy lasagna problem is an easy one to solve. Cook the lasagna noodles (or not, if you use the no-cook kind); mix up the cheese, eggs, etc, using less cheese than DH (dear husband) would like; prepare two pans or just assemble as two parts in the same pan: for you, layer noodles, sauce, less cheesy mix and spinach (squeezed as dry as possible); for him, layer noodles, sauce, less cheesy mix plus the rest of the cheese.
In general, it’s easy to bulk up pasta dishes with veggies.