Preheat oven to 350 degrees.
Combine dry ingredients in a large bowl.
Measure half and half into small saucepan, add split vanilla bean to cream, heat until just beginning to bubble on edge, do not boil. Turn off heat and set aside to cool. When cream is cool, take a sharp knife and scrape the inside of the vanilla bean out and add back to liquid.
Cut cold butter into small squares, add to dry ingredients, and cut in with a pastry cutter until mixture resembles oatmeal. Set aside.
Whisk egg and vanilla extract into vanilla bean cream.
Create a hole in the middle of the dry ingredients, add liquid to hole, gently combine until dough comes together.
Place dough onto a lightly floured surface, split in half and create two rounds about 1 inches thick and 8-10 inches in diameter. Place dough on a parchment lines baking sheet and place in freezer for 10 minutes.
Remove from freezer and cut each disk like a pie, 6 pieces each. Place in preheated 350 oven for 25 minutes.