Add flour, sugar, baking soda, baking powder, salt and softened butter in bowl of Kitchen Aid mixer.  Mix on low until combined. (You can use any mixer or mix by hand also)

Add buttermilk and egg.  Mix until well combined.

Turn out dough onto flour dusted surface. Knead a few times and shape into a flat round approximately 8 inches round and 2 inches thick

With a sharp knife cut a large X into dough, slicing about 1/2 deep.

Bake at 375 for 40-50 minutes.  Test at 40 minutes with a toothpick for doneness, it should come out clean.