This hearty vegetarian dish is a single serving. I bake it in a disposable mini loaf pan. I'm not sure if anyone is interested in single serving dishes, but I'm putting it online for my own personal use. This is my first recipe I've shared, and I'm posting it to use my ingredient list on supercook.com. I've never honestly measured any of the ingredients to make this, except for when making the instant mashed potatoes. You may notice that those ingredients differ slightly from what your package says. Since I use skim milk, I increase the milk and decrease the water, so it's the same amount of liquid without being too watered down. You could also use leftover mashed potatoes. As for the vegetables, you can really use whatever sounds good to you. This is my favorite combination for this dish, and sometimes I throw in a bit of frozen corn. Also, I prefer portabella mushrooms, but have used white mushrooms. Lastly, I usually make a few of these at a time and freeze whatever I'm not eating right away. I just let it all cool in the loaf pan and then put the whole thing in a quart-size freezer bag. If cooking from frozen, I recommend covering with foil and baking for about 30 minutes, then uncovering and adding the parmesan at this point and baking for an additional 10-15 minutes.