Preheat oven to 350 degrees F
Spray 13x9 baking dish with cooking spray and lightly dust with flour
In a medium bowl, whisk together flour, baking powder, baking soda, salt and spices
In a large bowl, cream together the butter and sugar
Beat in egg and molasses
Add dry mixture alternating with buttermilk, beating after each addition and scraping down the sides of the bowl
Spread batter evenly into prepared baking dish
Bake for 40-45 minutes or until toothpick comes out clean
Cool to room temperature or serve warm with whip cream
Store leftovers in airtight container