1preheat oven to 350.Prepare 8 by 8 inch pan or an 13 by 9 pan for a thinner cake with butter and flour.
Place the butter and molasses in small pan and bring to a boil over medium heat. Pour the mixture into the bowl of an electric mixer fitted with the paddle attachment. Cool for 5 minutes, then mix in the sour cream
2Meanwhile, sift the flour, baking soda, ginger, cinnamon, cloves, and salt together in a small bowl. Mix with your hands until combined. With the mixer on low speed, slowly add the flour mixture to the molasses mixture and mix only until smooth.
3Pour into the prepared pan and bake for about 35 minutes, until a toothpick comes out clean. Set aside to cool completely.
Cut into squares and serve warm with butter or whipped cream.