Preheat oven to 350 degrees and spray a 9x13 baking dish with baking spray or line with parchment paper.
Using a large bowl, beat until combined the cake mix, melted butter, and egg.
Press evenly into the baking dish.
Using a large bowl, beat the cream cheese and powdered sugar until combined and smooth.
Beat in the eggs, lemon zest, lemon juice, and lemon extract until combined.
Beat in the melted butter until combined.
Pour the batter on top of the crust.
Bake in the oven for 35-45 or until a light golden brown.
Remove from oven and allow to cool completely.
Dust with powdered sugar and cut into bars and enjoy!