Heat the oven to 400 degrees. Place the butter in the cast iron skillet and put in the oven while it preheats, remove when butter has melted.

In a large mixing bowl combine the cornmeal, baking powder, salt and pepper. Mix in the buttermilk, eggs and sour cream. Carefully pour the melted butter into the mixture, leaving some in the pan so it is greased. Fold in the cheddar cheese and peppers.

Spoon the mixture into the hot cast iron skillet, place in the oven and bake 18-20 minutes if using smaller individual molds or 26-30 minutes if baking in one single large cast iron skillet.