Heat oven to 400 degrees. Bake potatoes 1 hour or until tender when pierced. Peel when cool enough to handle. Meanwhile, melt butter in a 4 to 6 qt. pot over medium-low heat. Stir in onions and garlic; cover and cook 10 minutes until soft, but not brown. Add 2/3 of the potatoes and mash with a potato masher. Add broth, milk, salt and pepper. Bring to a simmer stirring occasionally. Cut remaining potatoes in small cubes. Add to soup and stir gently to reheat. Sprinkle each serving with toppings.
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