Place rack in top third of oven and pre-heat oven to 375°. In bowl of stand mixer, whisk together Biscuit & Scone Mix, salt, pepper, and cayenne. Using paddle attachment (or pastry blender), cut in butter until pea-sized crumbs are formed.
In a separate bowl, mix buttermilk, egg, cheeses, veggies and ham. Add this to the mixing bowl and mix until just incorporated.
Divide dough in half. Scoop half onto a piece of greased parchment or plastic wrap and gently form into a round, 1" to 1½" high. Cut with greased knife into 6 wedges and place on greased or parchment-covered cookie sheet. Repeat with other half of dough. Brush lightly with milk and sprinkle with a few large crystals or flakes of salt before baking. Bake 20 to 24 minutes until cracked and just starting to brown.
© Pamela's Products, Inc.