- 1/2 cup chopped sun-dried tomatoes (not packed in oil; about 2 ounces)
- 1/2 cup (packed) grated Parmesan cheese (about 1 1/2 ounces)
- 2 tablespoons olive oil
- 3 pounds russet potatoes, peeled, cut into 1-inch pieces
- 1/2 cup whole milk
- 1/2 cup half and half
- 3 tablespoons butter
- 1 teaspoon salt
- 1/4 teaspoon ground nutmeg
- 1/4 teaspoon ground black pepper
- Place sun-dried tomatoes in small bowl. Pour enough hot water over to cover tomatoes; let stand until softened, about 5 minutes. Drain. Return tomatoes to bowl; stir in 1/4 cup Parmesan and oil.
- Cook potatoes in large pot of boiling salted water until tender, about 20 minutes. Drain. Return potatoes to pot. Stir over medium heat until excess moisture evaporates, about 1 minute. Remove from heat. Add milk, half and half, 2 tablespoons butter, salt, nutmeg and pepper to potatoes. Mash until smooth.
- Butter 8x8x2-inch glass baking dish. Spread half of mashed potatoes in prepared dish. Sprinkle sun-dried tomato mixture over. Spread remaining mashed potatoes over. Sprinkle with remaining 1/4 cup Parmesan. Dot with remaining 1 tablespoon butter. (Can be prepared 1 day ahead. Cover and refrigerate.)
- Preheat oven to 400°F. Bake potatoes uncovered until heated through and top is golden brown, about 35 minutes (or up to 45 minutes if refrigerated).