Oven-roasted Root Vegetables November 1, 2022 Rutabagas are a fat-free food, high in potassium, and a good source of fiber. Pick up some rutabagas today from your local grocery store! Prep Time: 10 minutes. Cook Time: 45 to 60 minutes. Servings: 8. Ingredients 1 potato. 1 cup sweet potatoes. 1 cup carrots. 1 cup parsnips. 1 turnip. 1 cup rutabaga. 1 medium onion. 1 clove garlic. 1 1/2 tablespoons olive oil. Directions Heat oven to 400 degrees. Cut vegetables into large chunks. Place the vegetables in a roasting pan and toss with olive oil. Roast the mixture for 45 to 60 minutes, stirring every 15 minutes until the vegetables are tender and evenly browned.