Preheat oven to 350°F (175°C) and position rack in the center. Grease a 9x13 inch baking pan with non-stick spray, lining with parchment paper if desired for easy removal.
Combine ¼ cup sugar and 2 tablespoons cinnamon in a small bowl for the topping. Sprinkle 1 to 2 tablespoons evenly across the bottom of the greased pan and set the rest aside.
Unroll first can of crescent dough, pressing seams together firmly if using perforated rolls. Lay dough evenly into the bottom of the prepared pan, pressing to edges and patching any tears.
Beat softened cream cheese with hand mixer for 1-2 minutes until smooth. Add ¾ cup sugar, egg, and vanilla, beating another 1-2 minutes until completely creamy with no streaks.
Pour filling over bottom crust and gently spread into an even layer with a rubber spatula, working all the way to the edges without pressing hard on the dough beneath.
Unroll second can of crescent dough, pressing seams together. Carefully lay it directly over the filling, pressing gently to the edges and tucking under any excess dough.
Pour melted butter evenly over the top crust and spread to edges with a spatula or pastry brush. Sprinkle remaining cinnamon sugar generously and evenly over the buttered top.
Bake in center of oven for 30-35 minutes until top is deep golden brown and cinnamon sugar has caramelized. Slight jiggle in the center is normal; filling should not look liquid.
Cool on a wire rack for at least 30 minutes at room temperature. Cover and refrigerate for minimum 2 hours or overnight to allow filling to set completely for clean slicing.
Use a sharp knife to slice chilled bars into 24 pieces, wiping the knife clean between cuts for neat edges. Serve chilled or at room temperature with desired toppings.