Preheat oven to 350 degrees F

Mix the sugar cookie mix and the butter together until a dough forms. Press the dough into a 9x13 inch baking pan.

Bake 15 to 20 minutes or until golden brown.

While baking, beat together eggs, sugar, 4 tablespoons flour, lemon juice and lemon rind for at least 1 minute. Pour the mixture over the baked crust.

Bake the bars another 20 minutes, or until the lemon topping has set.

Sprinkle with confectioner's sugar when cooled.Dairy Free

These can be made dairy free by using a dairy free margarine.