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Preheat oven to 350°.
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In large bowl, combine cake mix, butter, and 1 egg with mixer until crumbly.
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Stir in cracker crumbs.
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Reserve 2 cups crumb mixture.
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Press remaining crumb mixture firmly on bottom of greased 13x9-inch baking pan.
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Bake 15-20 minutes or until golden.
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With mixer or wire whisk, beat sweetened condensed milk, lemon juice, and 3 egg yolks. Spread evenly over prepared crust.
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Top with reserved crumb mixture.
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Bake 20 minutes longer or until set and top is golden.
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Cool. Cut into bars. Store leftovers covered in refrigerator.