Step 1

Whisk together the flour, salt, baking powder, baking soda and sugar until well mixed. Add melted butter, mashed banana, vanilla extract, sourdough starter and egg. Mix well with a spoon. Fold in nuts.

Step 2

Spray a 9 x 5 bread pan with cooking spray. Add dough and bake in preheated 350 degree oven for 55 to 60 minutes until center tests done.