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How to make yeast from potatoes 1 medium potato1 1/2 cups of water1 cup of all-purpose flour1 Tbs sugarWash, peel, and boil the potato as you would for mashed potatoes, reserving the water.We’re peeling it for a couple of reasons. First, commercially produced vegetables contain pesticides, as well as growth retardant chemicals. Removing the peel helps to ensure those items don’t accidentally kill your homemade yeast.Let the water cool.Pour 1 1/2 cups of the reserved, cooled potato water into a one-quart jar.Gently stir in sugar and flour, mixing until smoothLet set in warm warm spot overnight, dont cover immediately is trapping wild yeast in air let set for a couple hours before covering. Stir before you cover.Cover the jar with a piece of cheesecloth or paper towel, and secure it with a mason jar ring or elastic band.Leave it a full day and overnight in a warm place to grow and expand.By morning, it should be bubbly and smell like yeastStore the potato yeast in a covered jar in the refrigerator and use as needed.This is a true yeast recipe, not a sourdough starter recipe, therefore it should not take several days, one night is sufficient.You can use this yeast in baking the same way you use traditional store-bought yeast, by proofing the yeast with warm liquids and a sweetener before adding the dry ingredients.This replaces 1 package of yeast.