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To make Sweet Potato Topping: Bring large pot of water to a boil.
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Add sweet potato, cover, and boil 10 minutes, or until tender.
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Drain, and return to pot.
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Mash with milk, margarine, cinnamon, and nutmeg; season with salt and pepper, if desired.
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Set aside.
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To make Filling: Heat oil in large skillet over medium heat.
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Add onion and leek, and saute 5 to 6 minutes, or until leek is soft.
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Add turnips, carrot, thyme, and rosemary; cook 2 to 3 minutes more, or until carrot begins to soften.
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Add wine, and cook 30 seconds to deglaze pan.
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Stir in beans and broth.
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Cover, and simmer 10 minutes, or until carrots and turnips are soft.
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Season with salt and pepper, if desired.
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Remove thyme sprigs from Filling, and discard.
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Pour Filling into 2- or 3-qt.
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casserole dish.
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Spread Sweet Potato Topping over Filling.
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Sprinkle with Parmesan cheese, if using.
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Preheat oven to 375F.
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Place casserole on baking pan.
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Bake, uncovered, 30 minutes, or until filling is bubbly and cheese has melted.
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Let stand 5 minutes before serving.
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Frozen cooking instructions: Preheat oven to 375F.
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Cover casserole, and place on baking sheet.
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Bake 60 to 75 minutes, or until filling bubbles and top is golden.
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Remove foil during last 10 minutes of baking.
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Let stand 5 minutes before serving.