Preheat oven to 425 degrees. Whisk together cornmeal, flour, sugar, baking powder, baking soda, and salt in a large bowl.
1 1/4 cup yellow cornmeal, 1 1/4 cup all-purpose flour, 2 Tbsp sugar, 1 1/2 tsp baking powder, 1/2 tsp baking soda, 1 1/4 tsp coarse salt
In a separate bowl, whisk together egg and buttermilk
1 large egg, 1 3/4 cup buttermilk
Add the wet ingredients to the dry ingredients, then stir to combine. Leave the batter lumpy, don't over-mix.
Melt butter in a 10-inch cast-iron skillet or a 2-quart baking dish in the oven while it is heating up.
4 Tbsp unsalted butter
Remove the skillet; swirl to coat bottom and sides with the melted butter.
Pour in the batter, then return to the oven.
Bake for 20 to 25 minutes, then remove from the oven.
Insert a toothpick into the cornbread, then remove it. If the toothpick comes out clean, the cornbread is done. If it has some batter on it, it's not yet done. Bake for a few minutes longer, if necessary.
Invert onto a cooling rack, and allow the cornbread to cool.
Invert the cornbread again for proper presentation.
Cut the cornbread into wedges, and enjoy! It tastes great as it is, and especially with a pat of butter and maybe some drizzled honey.