Cinnamon Sugar Cookie Squares

Name: Cinnamon Sugar Cookie Squares
Prep time: 40 min
Cook time: 30 min
Total time: 1 h 10 min
Ingredients: 1¾ cups all-purpose flour; 1 teaspoon ground cinnamon; 1 teaspoon kosher salt; 1 cup unsalted butter, softened; 1 cup light brown sugar, packed; 1 teaspoon vanilla extract; ½ cup ground walnuts; 1 egg, yolk and whites separated; ¼ cup white granulated sugar; 1 teaspoon ground cinnamon