The cookies are soft, tender and bursting with delicate citrus flavor finished with a sweet-tart glaze that melts into every bite for a perfectly balanced cookie!
In a medium mixing bowl, add the flour, baking powder, baking soda, and salt. Set aside until ready to use.
In the bowl of a stand mixer, beat the butter, shortening, and sugar until creamy, about 2 minutes. Add the egg, egg yolk, lemon juice, and vanilla, mixing until combined.
Slowly add the flour mixture, mixing until just incorporated.
Transfer the dough to a medium bowl, then cover and chill for at least 1 hour.
Heat oven to 350ºF (180ºC). Scoop the dough in tablespoon portions and drop onto a parchment paper-lined baking sheet.
Bake until the edges are lightly browned, about 10 minutes. Remove to a cooling rack and let cool.
For the glaze:
In a small mixing bowl, stir together the confectioners sugar, lemon zest, and lemon juice until smooth.
Once the cookies are cooled, drizzle the glaze over the baked cookies and serve.
Notes
Make sure the cookies are completely cooled before drizzling with the icing. If it is added when the cookies are still warm the icing can melt and absorb.