Preheat oven to 350°. Line a 9x13" pan with aluminum foil with the ends coming up 2" above the pan. Spray with baking spray.
Unroll one package of crescent dough and press on the bottom of the pan pushing to the edges.
Mix the lemon juice with about ¾ of the fresh lemon zest. Add the cream cheese and granulated sugar. Whip with electric beaters until smooth.
Spoon onto crust and spread evenly.
Unroll the second package of crescent rolls and spread over the top, stretching to the edges.
Brush the dough with the melted butter.
Mix 3 Tbsp of granulated sugar with the separated lemon rind. Sprinkle over the butter. Bake for 30 minutes until top is golden.
Cool on rack for 20 minutes. Using the ends of the aluminum foil lift the bars out of the pan. Cut into squares.Return to the baking dish and place in refrigerator for an hour or more before serving.