I usually make roasted potatoes, carrots, and brussel sprouts for my vegan friends for thanksgiving and Christmas. I don't have a recipe but it's basically:
Chop veggies into bite sized pieces
Toss with olive oil and garlic salt
Roast in oven at a high temperature for like 10-15 until they're done.
It takes some practice getting the timing right because the veggies all take different amount of time, but I like having the variety of three different roasted vegetables.