Preheat oven to 350°F and spray an 8x8 baking dish with nonstick cooking spray.
Combine all the ingredients for the crust, mixing thoroughly until you have a dough. (1 cup flour, ¼ cup powdered sugar, pinch of salt, ½ cup melted butter, and 1 tsp vanilla)
Press the dough into the bottom of the prepared baking dish, making sure to cover the entire bottom of the dish and the dough is spread out evenly.
Bake the dough for 20 minutes or just until the edges start to brown.
While dough is baking, combine all the ingredients for the for the filling in a medium sized mixing bowl. (1 cup sugar, 3 tbs flour, 3 eggs, ½ cup lemon juice, 1 tbs lemon zest)
Pour filling into baked crust. Bake for 26-28 minutes or until the center of the lemon bars is set and doesn’t jiggle.
Remove from oven and let cool completely.
Sprinkle with powdered sugar, cut, and enjoy!