Melt 4 ounces of chocolate in microwave by heating for 30 seconds then stirring and repeating process until it is melted and smooth.

Pour melted chocolate evenly into the bottoms of the heart molds and place in refrigerator to set.

Melt peanut butter and butter for 1 minute in microwave.

Stir until blended.

Add vanilla and powdered sugar and mix well.

Line a baking sheet with parchment paper.

Spread peanut butter mixture out on prepared sheet and spread to about 1/4" thickness.

Refrigerate for 15 minutes until firm.

Use cookie cutter to cut out 6 hearts and place in center of each mold.

Refrigerate for 10 minutes.

Melt remaining chocolate in microwave by heating for 30 seconds then stirring and repeating process until it is melted and smooth.

Pour melted chocolate into each mold over peanut butter heart to make sure it is covered and even.

Refrigerate 10 minutes until chocolate has set.