INGREDIENTS
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3 cups shortbread cookie crumbs (about 24 cookies or a 12-ounce package)
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1/2 cup melted unsalted butter, divided (see note)
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3 eggs
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3/4 cup pure maple syrup
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1/3 cup sugar
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1 teaspoon vanilla extract
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3 cups coarsely chopped mixed nuts (see note)
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1 cup chocolate chips