1. Preheat oven to 400°F. Line a rimmed baking sheet with parchment paper.
2. Layer ingredients on one half of the parchment paper. Season to taste with salt, pepper and peppercorns. Drizzle with olive oil and white wine, if using.
3. Fold and seal parchment over ingredients.
4. Bake 18-22 minutes, or until cooked through.
Tip: The French technique of cooking ingredients in parchment paper to retain moisture, called en papillotte (ahn pah-pee-yoht), also makes for quick and easy cleanup.