INGREDIENTS
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For the topping:
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2 Yukon gold potatoes, peeled and cut into large pieces (about 12 ounces )
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Kosher salt
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For the filling:
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6 tablespoons unsalted butter
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1 medium onion, chopped
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2 tablespoons all-purpose flour
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3 large ripe tomatoes, cored, and diced
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1 cup low-sodium chicken broth
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1 cooked rotisserie chicken, (about 2 pounds)
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1 (10-ounce) package frozen chopped spinach, thawed and excess moisture squeezed-out
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1 cup loosely packed grated Cheddar cheese
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1 large egg yolk