I made this constantly one semester during graduate school. It would be wonderful with warmed goat cheese on crostini.
1 red bell pepper, seeded and chopped into 1-inch pieces
1-2 yellow squash, sliced into circles, then halved
1-2 leeks, rinsed and sliced (white and light green parts only)
4 oz mushrooms, halved
1 Tbl olive oil
2-3 Tbl balsamic vinegar
1 Tbl Italian Seasonings (herb mixture: oregano, thyme, basil, etc.)
salt and pepper
Toss in a casserole dish. Bake at 350 for 30 minutes. Toss again and bake for another ten minutes or so. All quanities can be altered according to taste.
Other variation: add fresh halved tomatoes and cilantro with a little cumin sprinkled on top. Omit the Italian Seasonings.