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Line an 8-inch (20 cm) square baking pan with parchment paper.
In a medium saucepan over low heat, combine chocolate chips, sweetened condensed milk, and butter.
Stir constantly until the chocolate is fully melted and the mixture is smooth.
Remove from heat and stir in vanilla extract (and walnuts, if using).
Pour the mixture into the prepared pan and spread evenly.
Refrigerate for at least 2 hours or until firm.
Cut into squares and serve.
Serving and Storage Tips
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