Laurie, in recipes that contain baking soda or baking powder, swapping out the dry milk powder for dry buttermilk may change the texture and rise of your baked goods. However, since this recipe uses yeast and a sourdough starter to get its lift, you should be just fine to make the swap. You could also use lukewarm milk in place of the water in the recipe to get a similarly delicious result. Happy pretzel making! Kye@KAF

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