My lazy go-to veggie/vegan dish if I'm certain I can't be arsed with anything but my body needs something better than cheese and toast:
Canned cannellini or butter beans
Spinach (I usually go for frozen and chuck it in as is)
Olive oil
Seasoning
Lemon juice
I just put a bunch of spinach in a pot and sauté them in olive oil, when they are softer/no longer frozen, I add the beans. (If I have a piece of pepper or some sad looking tomatoes lying around, I cube them and add them in too.) I add some water to keep the mixture from becoming a dry paste, season it (I also add some garlic powder), leave it to bubble for a bit on medium heat until the beans are soft and the mixture looks creamy. Before I eat, I drizzle some lemon juice for freshness.
I always have the ingredients on hand so the whole process doesn't take longer than 10-15 minutes, it's healthy and it keeps me full. Tasty when cold too but I like it most when it's piping hot. You could add more water, blend it up and turn it into bean soup as well.