Wild Mushroom & Baby Arugula Bruschetta - Puff Pastry

Ingredients

• 1/2 of a 17.3-ounce package Pepperidge Farm® Puff Pastry Sheets (1 sheet), thawed
• 2 tablespoons butter
• 4 cups assorted wild mushrooms (shiitake, cremini, oyster and/or button)
• 1 large onion, thinly sliced (about 1 cup)
• 2 cups baby arugula leaves, coarsely chopped
• 1/4 teaspoon dried thyme, crushed
• 1/7 teaspoon ground black pepper
• 1 cup shaved Parmesan cheese