Heat oven to 375°F. Line cookie sheet with parchment paper. Unroll dough; separate into 2 rectangles. Place 1 rectangle on cookie sheet; press perforations to seal.
In small bowl, mix peanut butter and brown sugar. Spread over dough to within 1/4 inch of edges. Press marshmallows into peanut butter mixture; top with candy bars and remaining dough rectangle. Press edges and perforations to seal. Brush top with egg white; sprinkle with granulated sugar.
Bake 15 to 20 minutes or until deep golden brown. Cool 10 minutes. Serve warm or cool.