Changed a bit and it was still PLENTY sweet enough! Not sure if layers were necessary.
Stir together 2/3 c choco chips (I use these), 1/2c brown sugar, 1tbs cinnamon, 1/2c chopped walnuts(or stir them into batter)
1.5 c flour
1 scant tsp baking soda
1 scant tsp baking powder
2-3 bananas mashed (3 gives alot of banana flavor)
1/4c buttermilk or yogurt
Beat 6TBS butter(soft) with
Then mix in the banana and yogurt. Stir in flour till just mixed. Don;t overbeat.
In buttered 8x8 dish, pour half of batter. top with half of streusel. Repeat. (Or, what I might do next time is stir nuts and half of choco chips into the batter, and use 1/3c brown sugar 1/3c choc chips as the topping)
Bake 350 for 45 minutes.