Grease an 8-inch square baking dish or line it with parchment paper.

In a medium saucepan, combine the granulated sugar, unsalted butter, and evaporated milk.

Place the saucepan over medium heat, stirring constantly until the mixture comes to a rolling boil.

Allow it to boil for about 4-5 minutes, continuing to stir to prevent burning.

Remove from heat and stir in the powdered sugar and vanilla extract until smooth.

If using, fold in the chopped nuts just until combined.

Pour the fudge into the prepared baking dish and spread it evenly.

Let it cool to room temperature before refrigerating for at least 2 hours until set.

Once set, cut the fudge into small squares and enjoy!