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1
Preheat the broiler and place a rack in the middle of the oven.
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2
Arrange individual casseroles or a large casserole on a rimmed baking sheet set near the stove.
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3
Place the potatoes and parsnips in a medium pot and cover with water.
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4
Bring to a boil, salt the water, and cook until tender, 15 minutes or so.
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5
Drain and return to the hot pot.
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6
Add the horseradish, cream, salt and pepper, and chives and mash to the desired consistency.
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7
Stir in 1 cup of the cheese and the egg.
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8
Meanwhile, heat a Dutch oven or large skillet over high heat with the EVOO.
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9
Add the mushrooms and rosemary and cook for 10 minutes.
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10
Then add the carrot and onions.
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11
Season liberally with salt and pepper and cook for 5 minutes more.
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12
Add the garlic and stir, then add the kale, season with nutmeg, and wilt the kale into the pan, about 2 minutes.
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13
Add the Worcestershire and stock and bring to a boil.
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14
In a small skillet, melt the butter and whisk in the flour for 1 minute, then stir into the mushroom and kale mixture to thicken.
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15
Transfer the filling to the individual casseroles or large casserole.
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16
Top the filling with the mashed potatoes, sprinkle with the remaining 1/2 cup of cheese, and brown under the broiler for 2 to 3 minutes.