Ingredients
1 box lemon cake mix
1/2 cup butter melted
1 egg
1 14 oz can sweeten condensed milk
1/2 cup lemon juice
1 Tbs lemon zest

Instructions
Pre-heat oven to 350.
Spray a 9"x13" baking dish with non-stick cooking spray and set aside.
In a bowl mix together cake mix, butter, and egg until combined, press into prepared pan, and set aside.
In another bowl whisk together sweetened condensed milk, lemon juice, and lemon zest, pour over top of bars.
Bake for 25-20 minutes until set, remove from oven and let cool completely before cutting into squares.