This is my favorite way to cook vegetables. It smells good in the oven, and it tastes great once it gets done! The great part is that you can mix and match the vegetables, and it still tastes great.
Vegetables, enough to fill 8"x 11" pan - I always use onion and bell pepper with a combination of the following: zucchini, yellow squash, asparagus, green beans and tomatoes. You can use anything you like, but I would certainly keep in the onion and pepper.
4 Tbsp. Fresh Rosemary (word of the wise, do not use dried rosemary)
4 tsp. beef bullion
6 Tbsp. olive oil
2-4 Tbsp. balsamic vinegar
Cut veggies into bite sized pieces and arrange in 8"x 11" pan. Mix olive oil, bullion, and rosemary in a small bowl. Pour over vegetables. Cook in oven at 400 for an hour. Make sure to stir once or twice during cooking to mix vegetables. After removing cooked vegetables from oven, pour balsamic vinegar over top and serve. This makes GREAT leftovers!