Preheat oven to 350° F and grease a 6" round baking pan.
In a medium bowl, combine the egg, brown sugar, molasses, butter, milk, and vanilla.
Slowly mix in the flour, baking powder, salt, and spices into wet ingredients until combined.
Pour the mixture into the baking pan. Bake for 25 to 27 minutes or until a toothpick comes out clean. Let cool.