Buttermilk Cornbread

Preheat oven to 400°. Lightly grease an 8-inch cast-iron skillet, and heat in oven 5 minutes.
Meanwhile, whisk together flour, cornmeal, sugar, baking powder and salt in a bowl; whisk in melted butter. Add eggs and buttermilk, whisking just until smooth.
Pour batter into hot skillet. Bake at 400° for 30 to 33 minutes or until golden brown.