Lots of cheese isn’t vegetarian, has rennet in it. Check labels.

I've had this saved in my instagram for a while: Baked Brie and Caramelized Vegetable Pie.

https://cooking.nytimes.com/recipes/1024809-baked-brie-and-caramelized-vegetable-pie?algo=cooking_search_relevance_metric_ios_and_web&fellback=false&imp_id=919328661473552&req_id=5024700228436676&surface=cooking-search-web&variant=0_relevance_reranking

Couple of suggestions:
1) Make a gratin of thinly sliced zucchini, onions, and yellow and red cherry tomatoes. Just toss the vegetables with salt, pepper, a spoonful of flour in a bowl, drizzle olive oil on top, then bake in a ceramic or glass pan until the vegetables are soft. You could put some breadcumbs mixed with parmesan cheese on top and broil for a few minutes to get a nice crusty top.
2) Buy a couple of bunches of haricot verts (the very skinny sting beans). Cut off the brown end and cook in boiling water until just tender. For the dressing, thinly slice a handful of shallots, put them in a glass bowl, cover in olive oil, and microwave until the shallots are soft. Toss with cooked haricots verts. Salt generously.

Anonymous wrote:

Anonymous wrote:Mac & cheese seems like the obvious choice because it is a main and has protein.

I do not understand the suggestion of Mac and cheese as upping the game for a vegetarian main served to adults

You must be very fancy, because lots of families have mac and cheese (not the boxed kind) as the main with a side of vegetables. This won't work for OP's vegetarian but if you want to try a fancy mac and cheese order or make lobster mac and cheese. They are on the menu at most restaurants in our beach town.

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:Mac & cheese seems like the obvious choice because it is a main and has protein.

I do not understand the suggestion of Mac and cheese as upping the game for a vegetarian main served to adults

What don’t you understand? Macaroni and cheese is a great main dish, lots of protein. I make a great macaroni and cheese that one of my adult kids requests whenever he’s in town- says it’s his favorite.

I’ve never really understood why macaroni and cheese is listed sometimes as a side dish, it doesn’t make sense to me. I think of side dishes as consisting of mainly vegetables.

then be sure to add chicken nuggets

For a vegetarian?

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:Another simple NYT cooking recipe: sheet pan roasted feta with tomatoes, lemon and broccolini-

https://cooking.nytimes.com/recipes/1021277-sheet-pan-baked-feta-with-broccolini-tomatoes-and-lemon?unlocked_article_code=1.b04.1xVH.RX63HFLRVOY1&smid=ck-recipe-iOS-share

That looks really good.

I have trouble finding broccolini - which I prefer to broccoli, especially for special dinners

MOM’s and Trader Joe’s usually have it.

Thanks for this — these places are not in my usual circuit. And probably why I don’t regularly see broccolini.

If you don’t feel like cooking then Costco’s deli Mac and cheese is really good.

I agree with the macaroni and cheese suggestion. We always have that at Thanksgiving.

But as an alternative, I've made this Sartu di Riso as a vegetarian main dish for a party and it's fabulous. But, more work than mac and cheese

https://pin.it/1o3mWo0tz

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:Another simple NYT cooking recipe: sheet pan roasted feta with tomatoes, lemon and broccolini-

https://cooking.nytimes.com/recipes/1021277-sheet-pan-baked-feta-with-broccolini-tomatoes-and-lemon?unlocked_article_code=1.b04.1xVH.RX63HFLRVOY1&smid=ck-recipe-iOS-share

That looks really good.

I have trouble finding broccolini - which I prefer to broccoli, especially for special dinners

MOM’s and Trader Joe’s usually have it.

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:

Anonymous wrote:Mac & cheese seems like the obvious choice because it is a main and has protein.

I do not understand the suggestion of Mac and cheese as upping the game for a vegetarian main served to adults

What don’t you understand? Macaroni and cheese is a great main dish, lots of protein. I make a great macaroni and cheese that one of my adult kids requests whenever he’s in town- says it’s his favorite.

I’ve never really understood why macaroni and cheese is listed sometimes as a side dish, it doesn’t make sense to me. I think of side dishes as consisting of mainly vegetables.

then be sure to add chicken nuggets

I suspect you have never had good macaroni and cheese. I bet you think all macaroni and cheese is made with a powder that turns into and orange liquid-y “cheese.”

I love Mac and cheese but have never had it as a main

Interesting. Have you never had lasagna or ravioli or fettuccini Alfredo as main dishes? They all have very similar ingredients as macaroni and cheese and are very typically served as main dishes, not as side dishes.

Portobello mushroom steaks

Anonymous wrote:

Anonymous wrote:Another simple NYT cooking recipe: sheet pan roasted feta with tomatoes, lemon and broccolini-

https://cooking.nytimes.com/recipes/1021277-sheet-pan-baked-feta-with-broccolini-tomatoes-and-lemon?unlocked_article_code=1.b04.1xVH.RX63HFLRVOY1&smid=ck-recipe-iOS-share

That looks really good.

I have trouble finding broccolini - which I prefer to broccoli, especially for special dinners

Anonymous wrote:Do not know the recipe linked by a PP, but have made a mushroom Wellington for Thanksgiving before. Big hit all the way around!

I love that one, my family does too. Quick and simple. I change out the cheese for one kid. I do other ones too but that’s so quick.

Anonymous wrote:Another simple NYT cooking recipe: sheet pan roasted feta with tomatoes, lemon and broccolini-

https://cooking.nytimes.com/recipes/1021277-sheet-pan-baked-feta-with-broccolini-tomatoes-and-lemon?unlocked_article_code=1.b04.1xVH.RX63HFLRVOY1&smid=ck-recipe-iOS-share

That looks really good.

Mac n cheese with butternut squash, butternut squash risotto (add saffron if you want to be fancy), or stuffed acorn squash