I have several sourdough sweetbread recipes that are all variations of this same basic recipe. Don't be afraid to be creative...it would be hard to goof with this recipe.
2 cups flour
1 tsp salt
1 tsp baking soda
1 tsp baking powder
1 cup sugar
2 or 3 tsp cinnamon based on your preference
3/4 cup oil
1/2 cup starter
3 cups shredded zucchini
1/2 cup chopped walnuts
1/2 cup raisins
Whisk all dry ingredients together until mixed. In a separate bowl, mix together oil, zucchini, and starter. Combine both mixtures, stirring only until mixed. Gently stir in raisins and walnuts, stirring only to combine.
Grease and flour one large loaf pan or two smaller loaf pans. Pour batter into pan(s) and bake in a 350 degree oven for 55-60 minutes or until knife comes out clean.
Remove from pan after 10 minutes.