I love roasted veggies and make them at least once a week all year ‘round. The winter ones have more calories than the summer selections, but shoveling snow takes care of burning off the extras, LOL!
Leftover veggies are usually made into a hash or as a filling for an omelette at Brunch. (We only eat 2 meals a day). I like the idea of using them in sandwiches; never thought of that! :)
Wow, I like your idea of using roasted vegs in omelettes!