Preheat oven to 420°F or 215°C, and line one baking sheet with parchment paper.
In a medium-sized bowl whisk together the flour, cinnamon, salt, and baking powder.
Combine the frozen grated butter with the flour mixture and using a fork, pastry cutter, or your fingers, work the butter into the flour mixture until a coarse texture is formed, it will resemble small pea-sized crumbs. Set aside.
Add the buttermilk, egg, vanilla, and sugar into a bowl and mix together using a whisk, then add to the flour mixture along with the cinnamon chips and stir just until the scone dough comes together and the dry mixture is moistened.
Turn over the dough onto a floured working surface and knead 2-3 times to bring the dough into a ball shape. Work extra flour into the dough if it seems too sticky.
Once the scone dough is rounded, pat it down to about 1 inch in thickness, about 8 inches in diameter, then using a scraper or knife cut the dough into 8 wedges.
Transfer the triangle scones onto a lined baking pan and separate them about 2 inches apart. Brush the tops with egg wash and sprinkle with coarse sugar.
Bake the cinnamon scones for 20-22 minutes or until lightly golden brown on the top.
Remove the scones from the oven and allow them to cool slightly.
Serve warm and Enjoy!