Line your 8x8 inch baking dish with parchment paper for easy cleanup.
In a microwave-safe bowl, combine dark chocolate chips and coconut oil. Microwave in 30-second bursts, stirring each time, until completely melted and smooth.
Pour the melted chocolate into the prepared baking dish and spread evenly.
Sprinkle the mixed nuts evenly over the chocolate layer.
Lightly sprinkle sea salt over the top to enhance flavor.
Refrigerate for at least 30 minutes or until chocolate is firmly set.
Once set, lift entire slab using parchment paper, slice into squares, and store in an airtight container.
Notes
These bars store great in the fridge or freezer. Let soften slightly before eating if cold.