Preheat the oven to 425°F(218°C). Melt the butter in the cast iron skillet over medium heat, on the stovetop.
Combine the dry ingredients in a large bowl. Combine the wet ingredients in a small bowl. Pour the wet ingredients into the dry ingredients and stir to combine. Pour the melted butter into the batter, leaving about 2 tablespoons in the cast iron skillet. Stir the melted butter into the mixture until just combined. Pour the batter into the cast iron skillet.
Bake the cornbread for 20-25 minutes or until the top is golden brown. Remove from the oven and serve hot or warm. Store leftovers in a covered container at room temperature for up to 2 days.
Video
Notes
If using a grain mill, mill the dried corn and measure out 1 cup.
In the video we milled our flour using kamut wheat berries.