Remove papery outer skin from garlic bulb (do not peel or separate cloves). Cut top off bulb; brush with oil. Wrap in heavy-duty foil. Bake at 425° for 30-35 minutes or until softened. Cool for 10-15 minutes.
Meanwhile, place potatoes in a large saucepan and cover with water. Bring to a boil. Reduce heat; cover and cook for 15-20 minutes or until tender.
Place 1 cup broth in a blender. Squeeze softened garlic into blender; cover and process until blended. Drain potatoes; place in a large bowl. Add the butter, pepper, salt, garlic mixture and remaining broth; beat until smooth. Yield: 8 servings.