Sugar cookies

8 cups flour
3 tsp baking powder
1 tsp salt
2 cups butter
2/3 cup shortening
4 eggs
3 cups sugar
1 tbsp vanilla

TOPPING:
colored sugar
sprinkles
icing

Mix together all ingredients in a large bowl, stirring until all flour has mixed in very well. Put plastic wrap over bowl and set in fridge for 1 hour, to help dough stiffen up.
After an hour, turn dough out onto flour surface. Kneed and roll dough until it's thin enough to make your cookies. Cut with cookie cutters. Place on cookies sheets/pans/stones. Pour sprinkles or other toppings over each cookie.
Bake on 375 degrees for 12-15 minutes, or until edges are very lightly browned.