Cooking an all-in-one dinner is a bonus for the cook, the diners, and the clean-up crew. Here is a picture of my sheet pan as it came out of the oven.

The cook (me) has merely to chop up the vegetables cutting them in sizes that will make them cooked through all at the same time. I used a plastic bag to toss the vegetables in oil and salt. The sheet tray cooked at 400F for 28 minutes.
The diners (John and me) have a stunning, colorful plate. Roasted vegetables are the tastiest way to eat vegetables. The roasting process brings out their natural sweetness. The only garnish we used was mustard.

Finally the clean-up crew (John) has only to discard the aluminum foil from the sheet pan and load two plates, some cooking utensils, and two forks and two knives in the dishwasher.
Seriously, a sheet pan dinner is a win-win-win for both of us.