Preheat the oven to 350 °F. Line a 13”x9” pan with heavy-duty aluminum foil or parchment paper. Lightly grease the foil or the parchment paper.
Place the flour, powdered sugar, cold butter and vanilla extract in the bowl of a food processor. Pulse until the mixture just comes together but is still crumbly. Press the mixture onto the bottom of the prepared pan.
Bake for about 20-25 minutes or just until golden brown and baked through. Each oven is different so baking time may vary.
Meanwhile, in a large bowl, whisk together the eggs, granulated sugar, lemon zest and juice until blended.
Combine the ¼-cup of flour, baking powder and salt in a small bowl. Whisk it into the egg mixture until blended. Pour the lemon mixture over the prepared crust.
Bake on the middle oven rack for about 20-25 minutes, or until the filling is set and firm. Check often so they do not over-bake. Let cool in a pan on a wire rack for 30 minutes. Lift from the pan onto a wire rack, using the foil or parchment paper sides as handles. Let cool for 30 minutes or until completely cool. Cut into 24 (2-inch) squares.
Just before serving, dust with powdered sugar and place on a serving platter.
Notes
The lemon bars can be stored in an airtight container at room temperature for several days. Do not top with the powder sugar until you are ready to serve!
Recipe by Marilena's Kitchen at https://marilenaskitchen.com/how-to-make-easy-lemon-dream-bars/