I originally found this in the old Greens cookbook. It's a stew made with squash, corn, and beans. Sometimes I add chiles or tomatoes if I feel like it.
Dinner tonight is a frittata made with eggs, onion, mustard greens, rice, and maybe cheese. I cheat and brown it under the broiler rather than trying to flip it and get all of it back in the pan!
A lunch standby chez moi is tostadas enchiladas. Open a can of refried beans and heat. While it's warming up, fry some tortillas until crisp. When they're cool enough to handle, smear a goodly amount of the beans on each tortilla, top with chopped lettuce or diced tomatoes or pickled jalapenos or minced onion or olives or salsa or whatever you find in the fridge.
During Covid lockdown I got decent at making kimchi pancakes: chop a cup of kimchi (including the liquid), mix with about the same amount of wheat or rice flour (I use a combination of the two), add water if needed to thin to the consistency of a pancake batter and let stand for an hour or so. The pour into a lightly oiled skillet and cook until the edges turn dry, as you would for a pancake.
My stand-by vegetarian cookbooks are Molly Katzen's "The Moosewood Cookbook" (all of her books have some good recipes), Deborah Madison's Greens cookbooks, and various Indian ones. I like reading Bryant Terry's vegan cookbooks, although I haven't cooked from them. I recommend checking out your local library (or youtube, if you're more visually oriented), checking out a few, and seeing which ones fit best with your cooking philosophy.