In a large bowl add flour, salt, baking powder, baking soda, and brown sugar; mix well to combine. Cut butter into small cubes then quickly work it into the mixture (using your fingers, two forks, or a pastry cutter) until it resembles a coarse meal. Set aside. 

In a small bowl whisk together egg and milk, beating well to combine. Add liquid mixture to dry and use a fork to stir everything together until just moistened. Add in the Parmesan cheese, ham, and rosemary and gently fold them into dough with a spatula. 

Pour the shaggy dough out onto a clean, floured work surface and shape the dough into an 8-inch circle. Cut the dough into 8 wedges and carefully transfer to the prepared sheet. Bake 18-20 minutes, or until the tops are lightly golden brown. Cool for 5 minutes on the tray, then serve warm.

May substitute bacon, chives, or cheddar.