Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking dish or line it with parchment paper for easier removal of the bars later.

Crust Preparation: In a large mixing bowl, combine 1¾ cups of flour, ¼ cup of cornstarch, 1 tsp of salt, and 1 cup of powdered sugar. Mix until well combined.

Add Butter: Add the 2 sticks of cubed unsalted butter to the dry ingredients. Using a pastry cutter or your fingers, blend the butter into the flour mixture until it resembles coarse crumbs.

Form the Crust: Press the mixture evenly into the prepared baking dish, ensuring the crust is firmly packed and even.

Bake the Crust: Bake in the preheated oven for about 20 minutes or until the crust is lightly golden. Remove from the oven and let it cool slightly while you prepare the filling.

Lemon Filling Preparation: In a large mixing bowl, whisk together 6 eggs and 2¼ cups of sugar until smooth and well combined.

Add Lemon Zest and Juice: Add 2 tablespoons of lemon zest and ⅔ cup of freshly squeezed lemon juice to the egg mixture. Whisk until well mixed.

Incorporate Flour: Gradually add ¾ cup of flour to the lemon mixture, whisking continuously to avoid lumps and ensure a smooth filling.

Assemble and Bake: Once the crust has cooled slightly, pour the lemon filling evenly over the crust.

Bake: Return the baking dish to the oven and bake at 350°F (175°C) for 25-30 minutes, or until the filling is set and the top is lightly golden.

Cool: Remove from the oven and let the lemon bars cool completely in the baking dish.

Final Touch: Dust with Powdered Sugar: Once cooled, dust the top of the lemon bars with additional powdered sugar for a decorative touch and extra sweetness.

Cut and Serve: Cut into squares or bars and serve. Enjoy your homemade lemon bars!