Peter, I'm going to take some educated guesses here, since I haven't tested this: 1. Yes, you can halve the recipe. I'd suggest using 1 1/2 teaspoons yeast. 2. Yes, 2% milk is fine. 3. Try using 1/4 cup mashed potatoes, and 1/3 cup milk; adjust with additional milk if necessary. Good luck! PJH

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