Mash bananas, brown sugar, vanilla extract, and ground cinnamon.

In a large bowl, cream butter and sugar together and sour cream until light and fluffy. Add in eggs and beat until mixed.

Sift in flour, baking soda, and salt. Stir until just combined. Add in sour cream and stir.

Pour in mashed bananas, and mix until combined.

Divide batter into 2 loaf pans

Combine crumble ingredients. Cut in butter with a pastry cutter, and mix until the topping looks like coarse crumbs. Sprinkle coating evenly over the batter in both pans.

Bake at 325F for about 35-40 minutes or until cake tester comes out clean with just a few moist crumbs stuck to it. Allow to cool for 10 minutes. Move to a wire cooling rack. Slice and enjoy! Helen Klassen