1/2 cup butter, softened
1 cup brown sugar
1 Tbsp vanilla
4 very ripe bananas, mashed
2 cups all purpose flour
3 tsp baking powder
1/2 tsp salt
1/2 cup chopped walnuts
In a bowl combine: 2 Tbsp sugar, 1/8 tsp cinnamon, 1 Tbsp butter, and 1/8 tsp baking powder.
Preheat oven to 350 degrees. Lightly grease a 9X5 inch loaf pan.
In a large bowl, cream together the butter and sugar until light and fluffy. Stir in the eggs one at a time, beating well with each addition. Stir in vanilla and bananas. In a separate bowl, sift together flour, baking powder, and salt.
Blend the banana mixture into the flour mixture; stir just to combine. Fold in walnuts. Pour batter into prepared pan. Sprinkle crumb topping on top.
Bake in preheated oven for 1 hour, until a toothpick inserted into center of loaf comes out clean. (I think I only cooked it for about 45 minutes - but my oven seems to be hotter).