T.S.
My 19M old used to eat everything in sight. Seriously, I was worried that we were OVER feeding him. Lol. Now, it's not as easy.
In our house (we have a 19M old and an almost 4 year old), we make dinner and that's what's served. We are more strict with our 4 y/o and expect him to have at least ONE bite of everything. For the longest time he told us he didn't like peas and then one night he ate them all without us even asking. Can you say power struggle?
Anyway, with our 19 month old, we serve what everyone else is eating. Sometimes, he won't eat the broccoli - oh well. The next night he will inhale three servings of peas. We do make sure that dinner includes the following: meat (yeah, sometimes it's chicken nuggets), a veggie, fruit or yogurt and some sort of whole grain (even if it's just bread with butter).
What I have been doing is sneaking food. We make turkey tacos a lot and I spread some smashed avacado on there. They don't even notice. Or the whole grain pasta will have some spinach in there - again, didn't notice. At the same time, I serve the veggies in their true form so they are exposed to it.
In short (too late, I know), don't worry about it. Don't make dinner a battle any more than it's going to be. (Our 19M has taken to throwing food - oh what fun).