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1
Make sure to parboil the potatoes until soft-firm.
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2
Butter a 2-1/2-quart shallow casserole dish.
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3
Set oven to 350u00b0F.
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4
Arrange half of the sliced par-boiled potatoes in the bottom of the prepared dish.
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5
For the buttermilk-blue cheese sauce: melt butter in a medium saucepan over low heat.
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6
Add in garlic and shallots; saute for 1 minute.
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7
Add/whisk in flour, whisk and stir for 3 minutes more.
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8
Pour in the half and half and room temperature buttermilk all at once; cook/whisk until sauce thicken and is bubbly.
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9
Remove from heat, and stir in pepper, mayonnaise, mustard, Worcestershire sauce, parsley and half of the blue cheese; mix well to combine.
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10
Layer all of the sliced mushrooms over the potatoes in the casserole dish; top with half of the cheese sauce, and distribute the grated jack cheese over the sauce.
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11
Layer remaining potatoes over the jack cheese and sauce.
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12
Spoon with remaining sauce on top.
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13
Sprinkle with remaining blue cheese.
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14
Bake for 45 minutes. Remove from oven and sprinkle the potato chips over top; return to oven for 10 minutes.
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15
Remove from oven and arrange the cooked broccoli around the edges of the casserole (if using) and garnish with pimento (if using); bake for 5 minutes longer.
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16
Absolutely delicious!