Short Crust for Tarts

I make this crust to use as a tart shell
for banana cream, apple or strawberry tart.

Ingredients:
1 stick butter, room temperature
1 1/2 tbsp. shortening
5 tbsp. confectioners' sugar
1 c. flour
Dash salt
1 egg yolk

Directions:
Preheat oven to 300 degrees F.
Cream together butter, shortening,
confectioners' sugar. Add egg yolk.
Beat in flour and salt,
a stiff dough will result.
Pat dough into 10 inch springform pan,
bake at 300 degrees for 40 minutes.
Fill with your prepared tart filling.