Soup! Throw whatever you want in there– lentils, canned beans, canned tomato, chopped veggies, mushrooms, onion/garlic, meat, pasta, potatoes, whatever. If you want to add leafy greens like kale, or use frozen veggies instead of fresh, add them at the end of cooking. Fill up the pot with however much veggie broth you want, boil then bring to a simmer for about 40min, tasting and seasoning as you go. To make it more stew-like, use less broth.
Pasta! Make it easy by using a simple sauce of jarred tomato sauce, basil, and mushrooms or ground meat of choice. You can also make a simple sauce with canned or fresh tomatoes, olive oil, garlic, and cheese of choice.
Eggs! Scrambled or fried tastes great over rice, on toast, on a bed of greens, on top of ramen, ontop of beans, whatever!
Simple stir fry using frozen veggie and sauce mixes, add meat or tofu. If you don’t want to make rice, just boil Asian noodles instead, it’s faster.