This is one of my favorite treats from childhood. Although I only remember eating this as a breakfast food, it would make an amazing coffee cake.
1 1/4 cups flour
1 cup whole wheat flour
1 cup brown sugar
1/2 tsp cinnamon
1/2 cup margarine
(Mix together until it all crumbles together, separate approx 1/2 to 3/4 cup, set aside.
1/2 tsp baking soda
1 tsp baking powder
(mix into the crumble)
1 cup buttermilk (or reg milk and vinegar)
Pour into a loaf pan, or as I remember it, into a 9" round pan, pour the separated crumble over top.
Bake at 350F for approx half an hour.