Line a 9x9 inch baking pan with parchment paper. Set aside.
In a medium microwave safe bowl, microwave the chocolate chips and Nutella in 30 second intervals, mixing until smooth.
Pour in the sweetened condensed milk and mix until fully combined.
Spread the mixture evenly onto the prepared baking pan. Place in the fridge until set, around 3 hours.
Cut into squares and enjoy!
Notes
Storage: You can store this fudge at room temperature for up to 2 weeks, or in the fridge for up to 3 weeks.
Freezing: Slice the fudge into squares (or leave it as a large square) and wrap each individual piece in plastic wrap. Place in a large freezer-safe bag or container and freeze for up to 3 months. When ready to eat, allow to thaw in the fridge.
Make sure to cool the fudge in the fridge for at least 3 hours. This allows the fudge to fully set.
For clean cuts, wipe your knife clean with a warm and damp paper towel between each slice.