Measure and rinse 1/2 cup dried split peas. Add to a large saucepan with 1 1/4 cups of water and bring to a boil. Then reduce to simmer, cover and continue to cook for approximately 30 minutes, or until the peas are quite soft, but not falling apart. Drain, then purée, using a food processor, blender or a potato masher. Add water by tablespoons to purée if necessary to thin it — peas should be the consistency of canned pumpkin when done.
Measure out 1/2 cup of purée for the recipe and if there is any remaining, cover and refrigerate for use in other recipes — it will keep for 3-4 days or longer, if frozen.
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Preheat oven to 350° F (static) or 325° F (convection).
Beat the sugar and butter until fluffy, then add the eggs or egg substitute, sour cream, vanilla and cooled pea purée – mix well.
Sift together the dry ingredients in a large mixing bowl, then pour slowly into the wet ingredient bowl and beat together until integrated. Fold in the zucchini and nuts, if using. The batter will be fairly stiff.
Oil one loaf pan and scoop batter into pan, then smooth with a rubber spatula. If using mini loaf pans, oil 5-6 pans; if using muffin tins, oil 24 muffin tins. Fill each no more than one-half full, then sprinkle the tops with cinnamon-sugar mixture.
Bake large loaf for 50-55 minutes; mini loaf pans for 30-35 minutes; muffins for 20-30 minutes. Test the middles with a toothpick to be sure they are cooked through before removing to cool on a wire rack.
Enjoy!