01 - Line a 12-cup mini muffin tin with paper liners and set aside.
02 - Combine chocolate chips and coconut oil in a microwave-safe bowl. Microwave in 30-second intervals, stirring between each, until completely smooth and melted.
03 - Spoon approximately 1 teaspoon of melted chocolate into each paper liner. Tilt the tin gently to coat the bottom evenly. Transfer to freezer for 10 minutes to set.
04 - While chocolate sets, combine creamy peanut butter, melted butter, powdered sugar, and sea salt in a mixing bowl. Stir until completely smooth and well incorporated.
05 - Remove tin from freezer. Drop about 1 heaping teaspoon of peanut butter mixture onto each chocolate base. Gently flatten with a spoon, leaving a small border around edges.
06 - Cover each cup with remaining melted chocolate, using approximately 1 to 1.5 teaspoons per cup. Smooth the tops with the back of a spoon.
07 - Refrigerate for at least 30 minutes or until chocolate is completely firm and set.
08 - Carefully remove cups from paper liners. Store in an airtight container in the refrigerator for up to one week.