Yield: 4 servings; 1/2 cup each
Preheat oven to 425°F.
Line a large baking sheet with aluminum foil to keep it from getting stained. Lightly spray the foil with cooking spray.
Put the beets, carrots, onion wedges and potatoes on the foil. Drizzle the oil and sprinkle the oregano and salt over the vegetables, tossing gently to coat. Arrange the vegetables in a single layer so they don't touch.
Bake for 15 minutes. Stir. Bake for 10 minutes, or unti the vegetables are just tender when pierced with a fork.