Just about any lightly dressed fresh salad fits the bill. For a contrast, start with big glass bowl and add a small amount (quarter cup) of leftover cooked brown rice, a quarter cup of any canned bean you like (black, garbanzo, pinto, kidney, whatever), some bits of fresh broccoli or cauliflower, some frozen corn kernels, a tablespoon of whatever chinese sauce (hoisin, blackbean paste, szechuan, ...) and microwave covered for 1.5 minutes, stir, microwave again, stir. Then add the cold salad ingredients (baby spinach, tomatoes, croutons, blueberries, carrots, snap peas, ...), and a little dressing. Mix everything up and eat. Prep time is about 5 minutes including the 3 minutes of microwaving.
One could eat the above in massive amounts all day long. Clean up is trivial because the glass cooking bowl is the mixing bowl, then the serving bowl, then the sink/clean-up bowl.
It is also incredibly inexpensive.