How to Make It
Preheat oven to 450°.
Combine sliced leek and oil. Spread leek mixture into a jelly-roll pan coated with cooking spray. Bake at 450° for 10 minutes or until browned. Combine the leek mixture, arugula, spinach, mushrooms, and cheese in a large bowl. Drizzle with the dressing, and toss gently to coat.