Preheat oven to 400 F (200° C)
In a large bowl, whisk flour and baking powder together.
In a medium metal bowl, beat shortening, softened butter, and eggs together.
Gradually add sugar and vanilla until well combined.
Using a wooden spoon, mix in sour cream.
Gradually add flour mixture and mix until well combined.
Cover with plastic wrap and place in refrigerator for 2 to 3 hours.
On a floured surface, roll dough to 1/4 inch (1/2 cm) thick.
Use cookie cutters to shape cookies as desired.
Place on a greased cookie sheet 1 inch (2.5 cm) apart
Bake for 10 to 12 minutes or until golden brown.
Let cook on a wire rack.