1Line an 8x8 inch baking dish with parchment paper or lightly grease it.
In a medium saucepan, melt the butter over medium heat.
Add the peanut butter and stir until smooth and well combined.
Pour in the sweetened condensed milk and maple syrup, stirring continuously until the mixture is smooth and starts to pull away from the sides of the pan.
Remove the saucepan from heat and stir in the vanilla extract and salt.
Pour the mixture into the prepared baking dish and spread it evenly.
Let the fudge cool to room temperature, then refrigerate for at least 2 hours or until firm.
Once set, cut the fudge into squares and serve. Enjoy!