Line an 8 inch pan with foil, letting the foil extend over sides; grease lightly.
Combine butter, sugar, and milk in medium saucepan.
Cook, stirring frequently, until sugar is completely melted and it turns to a caramel color and is thickened.
Remove from heat. Stir in vanilla and optional nuts.
Spread in prepared pan. Cool for 15-20 minutes and then refrigerate 2-3 hours until firm. Lift fudge out of pan using foil. Remove foil, cut and serve.
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