If you're doing 1-a-day, a rice cooker can be a great simplifier. Throw a measure of rice & your protein into the cooker, some rough chopped veg if you like. 2 minutes prep. While it cooks, make some kind of a sauce - yogurt or mayo make great bases, just add whatever spices you like; gochujang or miso thinned out with some soy sauce, citrus, or vinegar. When the rice & protein is done, pour on the sauce, add some pickled veg if you like. 800-1000 calories, depending on how much fat is in your sauce, one cooking pot, one eating bowl. 20 minutes start to finish.