Measure out all the ingredients ahead of time to make the process smoother. If you’re using large marshmallows, cut them into smaller pieces so they melt quickly.

In a medium saucepan, combine the evaporated milk, granulated sugar, and salt. Stir well to combine. Place the saucepan over medium heat, stirring constantly to prevent the mixture from burning. Once the sugar has dissolved, continue to cook until the mixture starts to boil.

Once the mixture is boiling, add the marshmallows and chocolate chips. Stir continuously as the chocolate and marshmallows melt into the hot sugar mixture. This should take only a few minutes. Continue stirring until everything is smooth and well combined.

Once the fudge mixture is smooth, remove the saucepan from heat. Stir in the vanilla extract for flavor and, if desired, add ½ cup of chopped nuts for a crunchy texture.

Pour the hot fudge mixture into a greased or lined 8x8-inch baking dish. Spread the mixture evenly with a spatula, ensuring it reaches all corners of the pan.

Allow the fudge to cool at room temperature until it sets. You can speed up this process by placing the pan in the refrigerator for about 1 hour. Once the fudge is firm, cut it into squares and enjoy!