Preheat oven to 400 degrees F. Line a large baking sheet with foil. Spray with cooking spray. Place the asparagus spears on the baking sheet. Drizzle asparagus with balsamic vinegar and olive oil. Roll the spears so they are all well coated in the balsamic and oil. Season with salt and pepper.
Roast for 10-15 minutes. or until tender. I stir the asparagus half way through. Serve hot.