INGREDIENTS
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6 Gabila’s Potato Knishes, thawed
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2 tablespoons butter
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1 tablespoon extra virgin olive oil
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2 medium onions, thinly sliced
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1 teaspoon kosher salt
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Pinch of freshly cracked black pepper
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1 teaspoon dried thyme
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2 tablespoons all-purpose flour
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4 cups whole milk
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8 ounces shredded mozzarella cheese