Preheat oven to 425°F. In a bowl, mix dry ingredients. In another bowl, whisk buttermilk and eggs. Stir cheese, sausage, jalapeño, chives and corn into buttermilk mixture.
Swirl 1 Tbsp. butter in a 10-inch cast-iron skillet; place over medium heat. Whisk remaining butter into buttermilk mixture.
Place skillet in oven until butter browns slightly, 3 minutes. Stir buttermilk mixture into flour mixture. Pour batter into pan; bake until a toothpick inserted in center comes out clean, about 25 minutes.