Preheat oven to 425⁰. Prepare a baking sheet with cooking spray or parchment paper.
Sift flour, salt, baking soda and cream of tartar into a bowl. Stir in sugar. Using a pastry cutter or cold fingertips, cut the butter pieces into the dries until the pieces of butter are like small peas. Stir in the sundried tomatoes, Kalamata olives, blue cheese and feta. Mix well.
Add milk all at once and mix just until integrated. Turn dough onto floured cloth or board and gather into a ball. You may need to absorb a little of the extra flour for this step, but be careful to not over handle your dough. Use a very light touch.
Roll the dough ball out to about 1 ¼ inch in thickness. Cut dough into 8 triangles for large scones, or 12 triangles for smaller scones. Or, you can also use a biscuit cutter dipped in flour if you prefer round scones.
Place scones on prepared baking sheet and evenly distribute the Parmesan cheese over the tops of each scone. Refrigerate the scones for 10-20 minutes before baking. This lets the butter firm up, resulting in a flakier pastry.
Remove scones from the refrigerator and bake for approximately 12-14 minutes, or until the tops begin to turn golden-brown and Parmesan is beginning to brown.
Remove from oven and eat hot, or cool and store in an airtight container. Or, freeze the scones in an airtight container for serving later!