Add paper liners to a standard cupcake pan.
Chop 6 ounces of dark chocolate into small pieces.
Add chopped chocolate and 2 teaspoons of solid coconut oil to a heat-safe bowl.
Microwave in 30 second intervals, stirring after each, until chocolate is melted and smooth.
Spoon an equal amount of melted chocolate into the bottom of cupcake liners then use the back of a spoon to brush chocolate halfway up the sides of each liner.
Place cupcake pan in the freezer until chocolate is set, approximately 5 minutes.
Remove pan from the freezer and top each layer of chocolate with an equal amount of peanut butter. Smooth to level.
Return pan to the freezer for 5 to 10 minutes or until peanut butter sets.
Chop remaining 6 ounces of dark chocolate.
Add chopped chocolate and 2 teaspoons of solid coconut oil to a heat-safe bowl.
Microwave in 30 second intervals, stirring after each, until chocolate is melted and smooth.
Remove pan from the freezer and top each layer of peanut butter with an equal amount of chocolate.
Freeze for 5 minutes.
If desired, sprinkle sea salt on top of peanut butter cups.
Return to freezer for 5 minutes or until chocolate is set.
Soften peanut butter cups at room temperature for 15-20 minutes before enjoying.
Cover and store peanut butter cups in an airtight container in the refrigerator or freezer. Do not store at room temperature or they will melt.