This recipe I found somewhere on the forum:
Half cup brown sugar, and one a half cups SR flour 2 large bananas, half cup butter, 1 egg, quarter ts bicarb
Mix bananas for 10secs (I would use 3 bananas) add everything speed 6 30 - 40 seconds.
Bake 180 degrees for 1 hour (I only baked for 30-35 minutes)