Skillet Cornbread

1 cup flour
1 cup white or yellow cornmeal
1 tablespoon sugar
2 teaspoons baking powder
1 teaspoon baking soda
1/4 teaspoon salt
1 cup buttermilk
1/3 cup butter, melted
2 eggs, beaten
1 tablespoon butter
 
Heat oven to 400°F. Combine flour, cornmeal, sugar, baking powder, baking soda and salt in medium bowl. Stir in buttermilk, 1/3 cup melted butter and eggs just until mixture is moistened. Melt 1 tablespoon butter in heavy cast iron or oven-proof 10-inch skillet (2 to 4 minutes). Immediately pour batter into pan. Bake for 15 to 20 minutes or until toothpick inserted in center comes out clean. Serve warm.