Preheat oven to 350°F. Grease bottom of a 9 x 13-inch baking pan then line it with either parchment paper and grease it again.
Mix flour and butter; spread it in bottom of the pan.
Bake for 20-25 minutes or until golden brown. Let crust cool.
Mix cream cheese, powdered sugar, lemon filling, vanilla, and half of the whipped topping together. Spread over cooled crust.
Spread remaining whipped topping over lemon filling mixture.
Cover and chill until ready to serve.