Preheat oven to 350°. Spray a 12-inch cast-iron skillet with cooking spray.
For crust: In a large bowl, whisk together flour, confectioners’ sugar, and salt. Using a pastry blender or 2 forks, cut butter into flour mixture until crumbly. Pour mixture into prepared skillet, pressing firmly into bottom.
Bake until golden brown, about 25 minutes.
For filling: In a large bowl, whisk together sugar, buttermilk, melted butter, eggs, lemon zest and juice, cornmeal, flour, and vanilla until smooth. Pour filling over prepared crust.
Bake until set, about 30 minutes. Let cool completely. Cut into squares to serve. Garnish with confectioners’ sugar, if desired.
Notes
Kitchen Tip: Be sure to give your carton of buttermilk a good shake before measuring and adding it to your recipes. It can settle and separate over time.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/buttermilk-chess-bars/