from myrecipes.com

and cooking light

• 1/2 (15-ounce) package refrigerated pie dough (such as Pillsbury)
• 1 cup packed brown sugar
• 1/2 cup unsweetened cocoa
• 1 tablespoon all-purpose flour
• 3/4 cup 2% reduced-fat milk
• 1/3 cup light-colored corn syrup

• 1 tablespoon butter, melted
• 1 teaspoon vanilla extract
• 2 large eggs
• 2 large egg whites
• 1 cup frozen fat-free whipped topping, thawed
• 1/2 teaspoon unsweetened cocoa (optional)

directions here