I'm polling my vegetarian friends for dinner recipes. Cutting back on meat to 1-2x/week should help us save money as well as reduce our carbon footprint.
Homemade mac and cheese (this recipe is the best: https://www.ricardocuisine.com/en/recipes/4265-macaroni-and-cheese
Soups, curries, etc, obviously.
Smitten Kitchen has a mushroom bourguignon that, swear to god, tastes better than most beef bourguignons. Tasty, super-schancy, actually affordable.
Also, tip: spiced beans and chickpeas can be used to replace meat in most go-to recipes. Like, tonight, we're having chickpea gyros from this recipe: http://honestcooking.com/spiced-chickpea-gyros/
Our the filling for our tacos are basically pan-fried onions, add black beans, add chillin poweder and cumin and paprika and oregano to taste (what you'd do with beef, but... with beans).
My husband likes 'tuna' sandwiches (well, he mostly likes the greek yogurt and parsley and dill and paprika and sald and pepper and a bit of mustard that's mixed in with the tuna). Replace the tuna with smashed chickpeas or white beans. Works FINE in a sandwich, and doesn't stink up a luch box.
Disclaimer: we're not vegetarian; we eat meat 2-3 times/week total, though. For heath reasons, because I'd rather spend less and be more healthy, and because the toddler refuses to let a bite of meat cross her lips, and I'll be damned if I let her be under-nourished (you cannot live on rice+veg and ignore all meat, you need SOMETHING else) OR make 2 meals every night. Balancing act. :)