How to Make It
Preheat oven to 425°F. Coat a 10-inch cast-iron skillet with cooking spray.
Stir together flour, sugar, baking soda, and salt in a large bowl. Stir in cheese and dill. Stir together buttermilk, melted butter, and egg in a small bowl. Using a rubber spatula, stir wet ingredients into dry ingredients until a sticky dough comes together.
Press dough into prepared skillet. Using a sharp knife, cut a 1-inch deep “X” across the top of dough.
Bake until golden brown and a toothpick inserted in center comes out clean, 30 to 35 minutes. Let cool 20 minutes before cutting into slices.