Zucchini Gratin

You need a few vegetarian side dish recipes that are simultaneously delicious for all and this combination of zucchini, pumped up with Gruyere cheese, yellow onion, butter and bread crumbs, should be on your radar.  I suggest using a mandoline to make each slice of zucchini the identical thickness and to speed up the entire process.  Getting the top brown to your liking takes some well-worth-it attention at the end.

https://www.foodnetwork.com/recipes/ina-garten/zucchini-gratin-recipe2-1916945