1Place all the dry ingredients in a large bowl and stir with a whisk to combine.
2Place a 10-inch cast iron skillet over high heat, when hot add the butter and swirl to coat the skillet. When the butter turns a nut-brown color immediately remove from the heat and pour the butter into a heatproof bowl. Place the skillet into the oven in rack position 6 and do not wipe out.
3Set the oven to Bake, Convection, 400°F, for 20 minutes and press Start to preheat. Meanwhile, continue to the next step.
4Add the buttermilk and eggs to the brown butter and whisk to combine. Make a well in the dry ingredients and whisk the brown butter mixture into the dry ingredients to form a smooth batter.
5Once preheated, carefully spread the batter evenly into the hot skillet. Slide into the oven and cook for 20 minutes.
6The cornbread is ready when a skewer inserted into the center comes out clean. If not, cook it a little longer. Cool in the skillet for 10 minutes before slicing.