I found this on another website. I hope it's what you are looking for.

MOLASSES CRUMB CAKE

4 cups flour
1 cup sugar (white)
1 cup brown sugar
1/2 tsp salt
1 cup Crisco
2 cups boiling water
1 cup molasses (gold label Brer Rabbit)
1 Tbsp baking soda

Mix flour, sugar, salt and Crisco. Save 1 cup of these crumbs for topping. Mix water with molasses, add baking soda. Pour over mixture - blend well - pour into greased 9 x 13 x 2 inch pan. Mix (saved) crumb mixture with 3 T margarine. Add a little cinnamon (1/2 t). Sprinkle on top of cake mixture. Bake at 350 degrees for 40 minutes.