Covering the vegetables first allows them to steam and soften. Then, uncovered, they roast, which caramelizes natural sugars, concentrates flavors, and browns the dish.
Preheat oven to 375°.
Combine the first 7 ingredients in an 11 x 7-inch baking dish coated with cooking spray.
Combine broth and remaining ingredients in a medium saucepan; bring to a boil. Remove from heat, and pour over vegetables. Cover; bake at 375° for 20 minutes. Uncover; bake an additional 50 minutes.
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