½ to 1teaspoonof cinnamon mixed with 1 ½ tablespoons of sugar**
2-3tablespoonsmelted butter for brushing on top
Instructions
Put the flour in a large mixing bold and stir in baking powder, sugar and salt. Cut the butter into small chunks and scatter chunks of butter over flour. Toss to coat, then use a pastry cutter or your fingers to rub the butter into the flour to make a coarse meal with a few pea-size flecks of butter. Put the mixture in the freezer for about 20 minutes.
Alternative Method: Mix the flour, salt, baking powder and sugar as above, but grate the butter over, tossing occasionally. If you have a flat grater, this a good way to distribute it evenly throughout the flour mixture.
Position the oven rack to the center and preheat the oven to 425 degrees F.
Add the cold buttermilk to the flour mixture and stir gently until mixture just starts to come together. You will probably need to add a little more buttermilk, so just add it gradually until the dough doesn't seem flour. Add the chocolate chips and stir until everything has come together to form a dough.
On a floured surface, press dough into a ½ inch thick slab, then fold slab over itself into thirds. Press down and repeat twice so that it's a little over half inch (you can make it thicker if you want) thick. Using a 2 ½ inch round cutter, cut as many rounds as you can, gently pulling together scraps as you go.
Sprinkle dough rounds generously with the cinnamon sugar.
Put the biscuit rounds on a heavy, parchment lined baking sheet or arrange ¾ of an inch apart in a cast iron skillet. Bake at 425 degrees F. for about 15-18 minutes or until biscuits have browned. Remove from oven and immediately brush with melted butter. The time will vary depending on how thick you make the dough rounds and what size cutter you use.
Notes
If you want, you can add a tiny dash of vanilla to the buttermilk. As for the cinnamon, I preferred the larger amount, but my daughter said the cinnamon was overwhelming when a full teaspoon was used, so I gave a range. You can leave the cinnamon off altogether if you don't love it.