Frozen Chocolate Peanut Butter Cups

1. Line a baking sheet with paper cupcake liners. 
2. Melt the chocolate and coconut oil in a bowl in the microwave until melted.  Drop 1 tablespoon of melted chocolate into each liner, then use the back of a spoon to brush the chocolate 1/2 way up the sides of the liner. Place in the freezer for 10 minutes, until firm. 
3. Meanwhile, beat together the peanut butter, sugar, butter, and vanilla until smooth and creamy. 
4. Spoon 1 rounded tablespoon of peanut butter into each chocolate cup. Freeze another 10 minutes, then spoon over the melted chocolate, covering all the peanut butter. Sprinkle with flaky sea salt. 
5. Freeze until completely frozen, about 2 hours. Remove from the freezer, let sit 2-3 minutes. Eat and ENJOY!