Potato Knish Casserole
"A casserole version of a classic carb-y comfort. ...."
INGREDIENTS
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1/4 cup unsalted butter
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2 large onions, diced
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2 1/2 pounds yukon gold potatoes, peeled and quartered
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1 cup full-fat sour cream
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1 store-bought pie dough, defrosted
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1 large egg
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1 tablespoon olive oil
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1 to 2 teaspoons water
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Kosher salt and freshly cracked black pepper, to taste
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