Preheat oven to 350°F. Grease and line an 8×8 baking pan with parchment paper and set aside.
In a standing mixer with a paddle attachment, cream the melted butter, vegetable oil, and light brown sugar on high speed for 30 seconds. Add in the egg and vanilla extract and mix for another 30 seconds.
In a separate bowl, combine flour, cardamom, cinnamon, ginger, nutmeg, black pepper, baking powder, and salt. Fold dry ingredients into wet and place into prepared baking pan.
Mix together sugar and cinnamon and sprinkle over bars. Bake for 25 minutes, then allow to cool completely before cutting into squares!