Each serving of this tasty risotto provides two veggie servings.
Preheat oven to 425ºF. Grease a medium casserole dish.
Melt butter in a large saucepan. Add onion and cook over medium heat until soft. Add rice; cook for 2 minutes. Add broth; bring to a boil for 2 minutes. Stir in remaining ingredients, except Parmesan cheese.
Pour mixture into casserole dish. Cover and bake for 30 minutes. Stir in cheese. Serve immediately.