1. **Melt Ingredients**: In a microwave-safe bowl, combine the chocolate chips, sweetened condensed milk, and butter. Microwave on high for 30 seconds, then stir. Repeat in 15-second intervals until the mixture is smooth and fully melted.
2. **Add Flavor**: Stir in the vanilla extract and a pinch of salt until well combined.
3. **Pour and Set**: Line an 8×8 inch baking dish with parchment paper. Pour the fudge mixture into the dish and spread it evenly. If desired, sprinkle toppings on top.
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