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Place butter in a 10 in ovenproof skillet. Place in a 425 oven until melted.
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In a large mixing bowl, beat the flour, eggs, milk and salt until smooth. Leaving 1 tlbspn melted butter in the skillet.
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Pour the remaining butter into the batter, mix until blended.
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Pour batter into hot skillet. Bake for 15-20 minutes or until edges are golden brown.
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In a small saucepan, warm pie filling over low heat until heated through.
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Pour into center of puff pancake.
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Sprinkle with walnuts if desired.
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Serve immediately.