The other day the NYTimes Cooking site had a recipe for sheet pan sausage and vegetables with a mustard sauce. I thought it looked easy and could be adapted to our personal style of eating so I decided to give it a try. In my rendition I used much lower calorie smoked turkey sausage and cut down the amount of oil. Turns out this is a dead easy way to cook a bunch of food and you just need to know about how long each of your ingredients take and thus stagger putting items on the sheet pan. I learned this by totally burning the garlic which was supposed to be on the sheet pan for at least 30 minutes and was burnt after 15 minutes. Maybe a whole bulb of garlic is a better way to go.
For my sheet pan for two people I used about 5oz. of smoked turkey sausage, 7 new potatoes, a large onion cut into 8 pieces, part of a head of cabbage, and 2 carrots. It cooked for about 20 minutes at 425F. I served it with a mustard sauce made of Dijon mustard, lemon juice, parsley, and diced onion thinned out with a couple tablespoons of water.
Most any type of vegetable that you happen to have could be used. Just watch out for the cooking times as noted above. Also I think that tofu, chicken or especially salmon would be good as a substitute for sausage.