Preheat the oven to 375 degrees F.
Whisk the cornmeal, sugar, baking powder, salt and baking soda together in a large bowl and set aside. Whisk the buttermilk and eggs together in a medium bowl, then fold it into the cornmeal mixture and set aside.
Heat a 10-inch cast-iron skillet over high heat. Once smoking-hot, turn off the heat, add the butter and swirl it around to coat the pan as it melts. Pour the melted butter into the cornmeal mixture and stir to combine. Pour the cornmeal mixture into the hot skillet (you will hear a sizzling sound when pouring it into the pan) and bake until the edge is golden brown and the center bounces back when pressed with a finger, about 20 minutes. Serve warm or at room temperature.
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