In a microwaveable bowl, combine marshmallows, milk & salt.
Cook in the microwave on 'high' for 3 or 4 minutes (depending on the wattage of your microwave).
Stir until the marshmallows have melted and the mixture is smooth.
Add the chocolate chips and stir until they are all melted chips.
Stir in the nuts and vanilla essence.
Line a square pan (approx 8in/18cm) with waxed paper.
Spread fudge mixture evenly over the bottom of the pan.
Refrigerate until firm (approximately 2 hours).
Turn out onto a cutting board and remove waxed paper.
Cut fudge into squares and enjoy!