Caramel Pretzel Shortbread Cookies

1. Preheat oven to 300ºF.
2. In the bowl of an electric mixer, beat butter for about 3 minutes, or until light in color and fluffy.
3. Add sugars to butter and beat an additional 3 minutes.
4. In a small bowl, whisk together the flour and crushed pretzels. Add the mixture to the butter mixture in 4 separate additions, beating for 2 minutes after each one.
5. Roll mixture into tablespoon-sized balls and place on an ungreased or parchment-lined baking sheet. Press down until each cookie is about 1/2 inch thick.
6. Bake in the preheated oven fro 20 to 25 minutes or until just slightly brown on the outside and still slightly doughy-looking in the middle. This leaves a chewy center. Allow to cool for 3-5 minutes on the cookie sheet. If you prefer crunchy shortbread, bake a few minutes longer.