Preheat oven to 350 degrees F.  Grease and lightly flour 2 9x5x3 inch loaf pans  Combine dry ingredients (flour, baking powder, baking soda, salt and spices) in a large bowl. Cream together butter and sugar with a stand mixer or electric mixer.  Add eggs, one at a time, while beating slowly.  Add bananas, vanilla extract and sour cream and blend.  Slowly add the flour mixture to the wet ingredients and mix until well-blended.  Fold in chocolate chips, marshmallows and graham crackers.  Pour the batter evenly into the prepared pans and let it settle.  Tap the pans on the counter a few times to even out the batter and to let air bubbles rise to the surface.  Top each loaf with a sprinkle of chocolate chips, marshmallows and graham cracker crumbs.  Bake cakes about 1 hour, or until a toothpick inserted into the center of each loaf comes out clean.

 

Let bread rest 10-15 minutes before removing from the pans.  Serve warm, or cool completely.