Mix together dry ingredients except for baking soda. Cut in butter and shortening until well mixed.
Add the egg, egg yolk, 2 tbsp. milk and sprinkle baking soda over the above mixture.
Add the vanilla (+ or -) and last tbsp. of milk AS NEEDED until dough comes together in a ball. Adjust with the vanilla and milk until dough is formed. The dough ball should not be wet and sticky.
Preheat the oven to 350 degrees.
Chill the dough for at least 1/2 hour.
Cut cookies in shapes with cookie cutters as desired.
Transfer cut cookies to ungreased baking sheets and bake until lightly browned and not doughy. Time will vary depending on weather and oven, but approximately 8-12 minutes.
Transfer to paper towels to cool.
Cookies may be iced with butter frosting after cooling
sprinkle dough with sugar, nutmeg, or cinnamon sugar before baking.