INGREDIENTS
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1 1/2 cups graham cracker crumbs
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1/2 cup unsweetened cocoa, divided
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1/4 cup sugar
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1/2 cup (1 stick) butter, melted
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1 (14-ounce) can sweetened condensed milk
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1/4 cup all-purpose flour
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1 egg
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1 teaspoon vanilla extract
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1/2 teaspoon baking powder
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3/4 cup chopped walnuts
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2 cups (12 ounces) semisweet chocolate chips