Thanks for baking along with us, Jennifer! We haven't tested a version of this recipe that relies solely on an active sourdough starter for leavening, but for added flavor and a little extra oomph, you could certainly substitute starter for an equal amount (by weight) of flour and liquid called for in the recipe. We'd suggest subbing 8 oz of starter for 4 oz of flour and 4 oz of liquid, as we explain in our blog post entitled "Adding sourdough to a recipe". And not to worry, that eclair recipe will be right there waiting for you, whenever you feel so inclined. Mollie@KAF

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