Instructions

1. Preheat oven to 350°F. Grease and line an 8 x 8″ baking pan with parchment paper and set aside.
2. In a standing mixer with a paddle attachment, cream the melted butter and sugar on high speed for 30 seconds. Add in the egg and bourbon and mix for another 30 seconds.
3. In a separate bowl, combine flour, cream of tartar, and salt. Fold dry ingredients into wet, mixing until combined. Place into prepared baking pan.
4. Mix together additional sugar and cinnamon and sprinkle over bars. Bake for 30-35 minutes, until a knife in the center comes out mostly clean, then allow to cool completely before cutting into squares!