Remove white papery skin from garlic heads (do not peel or separate the cloves). Wrap each head separately in foil. Bake at 350° for 1 hour; cool 10 minutes. Separate cloves; squeeze to extract garlic pulp. Discard skins.
Place potato and onion in a saucepan; cover with water, and bring to a boil. Cover, reduce heat, and simmer 15 minutes or until potato is tender. Drain in a colander over a bowl, reserving 1/4 cup cooking liquid. Combine garlic, potato mixture, 1/4 cup cooking liquid, and remaining ingredients; mash with a potato masher.
These potatoes were really good. The rosemary and garlic were really flavorful. While the texture of the potato was still really good and I appreciated how low calorie they were, I still kind of missed the creamy milk n' butter potatoes I was used to. I will make these again though! Worth the sacrifice.
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