Preheat oven to 350 degrees.
Spray an 8X8 inch baking dish with cooking spray.
Add a little flour to your fingers to break apart cookie dough. Evenly press sugar cookie dough into the bottom of the baking pan.
Bake for 12 minutes. Remove pan from oven and cool for 10 minutes.
While the cookie crust cools, add butter, sugar, salt and flour to bowl of a mixer and beat until combined.
In a separate bowl, whisk together the eggs, vanilla extract, lemon juice, and lemon zest until combined.
Pour into the flour mixture and mix at medium speed until smooth and creamy, about 2 minutes.
Carefully spread lemon brownie batter evenly over cooled cookie dough (dough will still be warm and may move around just a bit.)
Bake for 20-25 minutes, or until they turn golden on the edges and a toothpick inserted in the center comes out clean. Cool and serve. I like to sprinkle a bit of powdered sugar on top. It's delish!