INGREDIENTS
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2 cups all-purpose flour, plus more for dusting
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1/2 teaspoon kosher salt
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12 tablespoons butter (1 1/2 sticks), cold and sliced into chunks
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1 large egg, lightly beaten
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1 tablespoon cold water
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1 small Yukon gold potato, finely diced
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Kosher salt
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1 tablespoon olive oil
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8 ounces bulk mild or sweet Italian pork sausage
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3 cups fresh baby spinach
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Freshly ground black pepper
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4 green onions, sliced
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3 large eggs
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1/2 cup milk
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1 cup grated gruyere cheese