- Preheat oven to 350°F. Spray a 9x13-inch baking dish with cooking spray. 
- To a medium bowl, add cream cheese, 1 cup sugar, egg yolk, and vanilla. Mix until smooth. Set aside. 
- Roll out a tube of crescent rolls onto the bottom of the prepared baking dish. If using the perforated dough, press the seams together lightly to seal. Crescent roll sheets would also work. 
- Spread the cream cheese mixture evenly over the layer of crescent rolls. 
- Roll out the second tube of crescent roll dough over the cream cheese layer. Press the seams together lightly. 
- Using a hand mixer, beat the egg white until frothy. Brush over the top. 
- In a small bowl, mix the remaining ½ cup of sugar and cinnamon. Evenly sprinkle this mixture over the egg white. 
- Bake for 25-30 minutes, or until the top is golden brown. 
- Remove from the oven and allow the bars to cool at room temperature for at least 30 minutes. 
- Once cooled, transfer the baking dish to the refrigerator. Chill the bars for at least 2 hours, up to overnight, before slicing and serving. 
- Serve cold.