1. Lightly grease the inside of your slow cooker with cooking spray or line it with parchment paper for easy removal.

2. Add the chocolate chips and sweetened condensed milk to the slow cooker.

3. Stir in the vanilla extract and salt.

4. Cover the slow cooker and set it to low heat.

5. Cook for 1 to 2 hours, stirring every 30 minutes, until the chocolate is completely melted and smooth.

6. If using, stir in the chopped nuts.

7. Pour the fudge mixture into a greased or parchment-lined 8×8 inch baking dish.

8. Allow the fudge to cool at room temperature, then refrigerate for at least 2 hours or until firm.

9. Once set, cut the fudge into squares and enjoy!

For a different twist, try using dark chocolate chips for a more intense chocolate flavor. You can also add a teaspoon of instant coffee granules to enhance the chocolate taste. If you’re a fan of mint, stir in a few drops of peppermint extract along with the vanilla. For a festive touch, sprinkle crushed candy canes on top before the fudge sets. And if you’re feeling adventurous, try swirling in some peanut butter or caramel before chilling for a delicious flavor combination.