Line a 9x13-inch pan with parchment paper or foil sprayed with baking spray, and leave a little overhang to lift the fudge out when set.

Place the chocolate chips and condensed milk in a large microwave-safe bowl and microwave for one minute.

Stir well to combine. If the chocolate chips aren't melted completely, microwave in 15-second increments stirring in between until the mixture is smooth.

Stir in the peanuts and marshmallows and immediately pour into the prepared pan.

Leave the fudge to cool at room temperature. Or if you are impatient, put it in the fridge to speed up the process!

When the fudge has cooled and set, lift it out from the pan using the parchment paper, then cut into squares and enjoy!

Store in an airtight container at room temperature (for up to 2 weeks) or in the fridge (for up to a month).