We're glad you're so enjoying this recipe, Charla! Either or both of these substitutions can work, but we'd suggest trying them one at a time, at least at first, so that you can judge the results of each for yourself. For sourdough starter, try subbing 8 oz (1 cup) of fed starter for 4 oz (1 cup) of the flour and 4 oz (1/2 cup) of the water called for in the dough. Our White Whole Wheat Flour would make for an especially good substitution, as it's lighter in color and milder in flavor than traditional whole wheat. You can sub it for up to 25% of the total amount of flour without having to make any other adjustments. Much more than that, and you will start to notice differences in texture, flavor and color that may or may not be to your liking. Mollie@KAF

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