For ideas:
Crispy fried potato frittata type things always seem to go down well with children, and are easy to insert other veg into.
Mini pies, quiche, tarts etc. that they can pick up and eat, are another nice way to expand with vegetables that they wouldn't eat in isolation.
Deep frying veg (although not healthy!) can also be a good way to get children to open their mind. My son never liked mushrooms, until he had some crispy fried ones.. liked them, and was open to eating them in different forms
Japanese style okonomiyaki is also a great easy dish to get children to like cabbage.
Sweat and sour meet with pineapple was another favorite with my son and his friends, especially those who didn't like meat.
(That is all a lot of fried stuff, but frying is the predominant cooking technique in the part of the world where I live, so we do it a lot!)
That being said, I wouldn't change from the meals that you and your partner already like to eat + cook too much. Unless it is a special occasion when it can be his turn to pick, or you feel like being especially nice that night.
Cook what you and your husband like to eat, and if it requires a bit of de-constructing for him. no problem. Kids are naturally somewhat fussy eaters, and unless they have medical issues surrounding eating disorders (which this doesn't seem to be), then they will adjust to what their parents are eating given enough time and patience.
It just takes a lot of time and patience. If your son doesn't like sauces, the worst thing you can do is find meals without sauces to cook for him. just keep cooking your lovely sauce-filled meals, and eating them around him. Give him reasonable adjustments (sauce on the side, less spicey, less salty, in a sperate bowl, only mixed with half etc.) but eventually he will find out that he likes it. Kids can take 10-20 times of trying something before 'magically' they like it. You never get to that part though, if you start to avoid meals/ingredients. And instead, these things just stay ingrained as things that he knows he doesn't like.