Preheat oven to 350°. Spray a 12x8-inch baking pan with baking spray with flour. Line pan with parchment paper, letting excess extend over sides of pan.
For crust: In a large bowl, whisk together flour, confectioners’ sugar, and salt. Using a pastry blender, cut in cold butter until mixture is crumbly. Firmly press mixture into bottom of prepared pan.
Bake until golden brown, 20 to 25 minutes.
For filling: In a large bowl, whisk together granulated sugar, buttermilk, melted butter, eggs, lemon zest and juice, cornmeal, flour, and vanilla until smooth. Pour filling into prepared crust.
Bake until set, 30 to 40 minutes. Let cool completely. Using excess parchment as handles, remove from pan, and cut into squares. Garnish with confectioners’ sugar, if desired.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/lemon-chess-bars-recipe/