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Preheat the oven to 350° F (180°C). Spray a 9x13 baking pan with non-stick spray and set aside.
In the bowl of a stand mixer or with an electric hand mixer, combine the butter, powdered sugar, and egg until smooth and creamy.
Next, add the lemon extract and lemon zest, mixing until evenly distributed.
Scrape down the sides and add the cake flour, baking powder, and salt. Mix until a sticky dough forms.
Spread the soft cookie dough into the bottom of the prepared pan.
Bake at 350°F (180°C) for 11-15 minutes, or until the cookie bars look dry on the top.
While the bars are baking, make the icing by combining the butter and vegetable shortening until smooth.
To the butter/shortening mix, add the powdered sugar and enough lemon juice to bring the mixture together into a thick frosting.
Continue mixing while adding the rest of the lemon juice to thin out the icing.
As soon as the cookie bars come out of the oven, pour and spread the icing onto the bars and garnish with a little extra lemon zest.
Once the cookie bars cool completely, cut and enjoy!