Maple Hazelnut Pie

INGREDIENTS

• 1/4 cup (1/2 stick) unsalted butter, cut into 1/2-inch cubes
• 1 refrigerated pie crust (half of 15-ounce package)
• 1/2 cup light corn syrup
• 1/4 teaspoon salt
• 3 large eggs
• 1 teaspoon vanilla extract
• Nonstick vegetable oil spray
• 1 large egg white, lightly beaten to loosen
• 1 cup hazelnuts, husked, coarsely chopped (about 5 ounces)
• 1/2 cup (packed) golden brown sugar
• 2 tablespoons bourbon
• 3/4 cup pure maple syrup (preferably Grade B)