In the bowl of your food processor combine all the dry ingredients for the crust and pulse a few times to combine well.
Add in fat and pulse a few times..
Add in egg and pulse a few times..
Add water as needed to make a dough that resembles a pie crust dough - it should be dry but stay together - add water in very small increments if needed
Allow dough to chill for at least 30 minutes to overnight tightly wrapped in plastic.
While your dough is chilling, cook your beef and season with taco seasoning according to package taco seasoning direction - set aside
Remove your dough from the fridge and divide into 12 equal portions
Press each portion into an individual cup of a muffin pan - spreading with your fingers up the sides
Fill each dough cup with 1/12th of the taco meat and 1/12th of the cheese