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How to make stained glass window cookies
Preheat the oven to 350 degrees f (180 degrees c).
Sift together flour, baking powder and salt.
In a large bowl, cream together the butter, shortening and sugar.
Add vanilla, eggs and milk to combine. Add 2 1/2 cups of the flour mixture, then add more until the dough starts to come away from the sides of the bowl.