Try this with your mature sourdough starter. (Note: If your starter is not mature yet, you can still make this. Double the starter and baking soda and decrease the water half.)
1 cup activated starter (this means starter that has been fed within the past 2 hours)
1 cup water
1/2 cup brown sugar
1/4 cup oil
3 mashed bananas
Mix all these wet ingredients. Then add….
2 tbls cocoa powder
3/4 tsp. salt
1 tsp baking soda
Handful of chocolate chips
Add flour until the dough resembles a stiff buttercream frosting.
Pour into an oiled or buttered casserole. Let it rise, covered, in a warm place until it reaches the top of the pan, or about 2 hours.
Remove the cover and bake at 400 degrees for 30 minutes, or until a toothpick comes out clean.
Poured into casserole. Ready to rise.
Risen for two hours. Ready for the oven.