Step 1: Prepare the Chocolate Shell

1. Melt Chocolate: In a microwave-safe bowl, combine the chocolate chips and coconut oil (if using). Microwave in 30-second intervals, stirring between each, until melted and smooth.

Step 2: Assemble the Cups

1. Coat Muffin Tin: Using a silicone muffin tin or paper liners, spoon a small amount of melted chocolate into each cup to cover the bottom. Use the back of a spoon or a brush to spread the chocolate slightly up the sides.
2. Chill: Place the muffin tin in the refrigerator for about 10 minutes to allow the chocolate to set.

Step 3: Prepare the Peanut Butter Filling

1. Mix Filling Ingredients: In a mixing bowl, combine the peanut butter, powdered sugar, and vanilla extract. Mix until smooth and well combined.

Step 4: Fill the Cups

1. Add Peanut Butter: Remove the muffin tin from the refrigerator. Spoon a generous amount of the peanut butter filling into each chocolate cup and gently flatten.
2. Add Jelly: Place a small dollop of jelly or jam on top of the peanut butter layer.

Step 5: Finish with Chocolate

1. Top with Chocolate: Spoon the remaining melted chocolate over the jelly layer, covering it completely. Smooth the top if needed.
2. Chill Again: Return the muffin tin to the refrigerator and chill for an additional 20 minutes, or until fully set.

Step 6: Serve

1. Remove from Molds: Once set, gently remove the peanut butter and jelly cups from the muffin tin or peel away the liners.
2. Enjoy: Serve chilled or at room temperature. Store in an airtight container in the refrigerator for up to one week.