In a large mixing bowl, place two cups of Bisquick and three quarters of a cup of chilled shortening. It’s easier if the shortening is cut into cubes. Mix with a pastry cutter until crumbly. Pour eight tablespoons of water into the mixture and mix until the dough becomes moist but not sticky. If too sticky, add a little Bisquick.
Divide the dough into two equal pieces, wrap in plastic wrap and chill in the refrigerator while preparing the filling.
In a large skillet, heat two tablespoons of vegetable oil.
Add two pounds of ground beef, one large grated potato, one cup of sliced mushrooms, and one chopped onion. Cook until the meat has browned and drain any excess liquid.
Stir in two cloves of minced garlic, two teaspoons of salt, one teaspoon of thyme, one teaspoon of pepper, and a pinch of cloves and nutmeg. Cook for an additional five minutes. Remove from heat and place in the refrigerator for at least thirty minutes.
Preheat the oven to four hundred degrees and grease a pie pan.
Roll out each piece of dough and place one into the bottom of the greased pan.
Spoon in the filling and place the top piece of pie pastry over the top.
Seal the edges, brush the top with the beaten egg and vent using the tines of a fork.
Bake for approximately one hour and enjoy.