These disappeared so fast! The kids loved them!
The easiest way to do this is in a food processor*.
Put dry ingredients in food processor, whir slightly to mix. Add chocolate chips and cut butter into chunks and put in the food processor and whir until mixed and crumbly.
Beat egg and sour cream slightly and pour into food processor, whir until dough forms a ball.
Place on greased (or parchment paper) baking sheet and press into a circle, about 8 inches. With a sharp knife, cut into 8 pieces (pie/triangles). Bake 15-20** minutes at 400˚.
Beat egg and sour cream slightly and then add to butter/dry ingredients and mix in with a wooden spoon, or knead by hand. The warmer the dough gets, the stickier, so you could start with frozen/grated butter if you are going to use your hands.
**I do 20 minutes on my stone baking sheet, regular baking sheets will probably be a few minutes less.
Serve warm or completely cooled.