Step 1

Preheat the oven to 350°F (180°C). Line an 8-inch square baking dish with parchment paper, making sure the ends extend above the edges of the dish to allow for easy removal.

Step 2

In a large bowl, combine the all-purpose flour, powdered sugar, and salt for the crust. Add the butter cubes and toss to coat them with the dry ingredients. Add the vanilla extract, if using.. Cut the butter into the flour mixture using a pastry cutter or your hands until the dough is crumbly.

Step 3

Press the dough into the bottom of the prepared dish.

Step 4

Bake the crust for 15-20 minutes or until golden brown. Remove the pan from the oven to allow it to cool slightly while you make the filling.

Step 5

In a medium bowl, combine the flour, sugar, and lemon zest. Whisk until well mixed. Add the eggs and lemon juice, and whisk until smooth. For a smoother filling, if desired, strain the mixture through a fine-mesh sieve before pouring it onto the warm crust.

Step 6

Bake for the lemon squares for 20 minutes, or until the filling is set.

Step 7

Let cool in the pan for 20 minutes-1 hour before lifting it out using the parchment paper. If desired, dust with additional powdered sugar. Cut into squares. Lemon squares can be stored in the fridge for up to 3 days.

Step 8

Enjoy!