Low-Calorie Potato, Onion, and Garlic Gratin

Yield: 6 Servings
Categories: Main Dishes, Garlic, Potato
4lgBaking potatoes, baked,
... scooped out and mashed
2lgGarlic heads, roasted
2lgOnions, baked
Salt and pepper to taste
2tbButtermilk
4tbParmesan, grated
1/4cSkim milk
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