In a mixing bowl, combine peanut butter, butter, brown sugar and powdered sugar.

Place chocolate chips in a microwave-safe bowl. Microwave for 30 seconds, then remove the bowl and give it a stir. Place the bowl back into the microwave and repeat the process until you stir the chocolate and it's smooth and melted.

In your heart tray, place enough chocolate in the heart shape to cover the bottom of the mold.

Add 1 to 2 teaspoons of your peanut butter mixture on top of the chocolate (you can kind of mold it into a flat heart shape or leave it in a ball shape - whatever you prefer).

Cover the peanut butter with more melted chocolate until the heart mold is full.

Stick in the refrigerator or freezer until hardened. Store in an airtight container in the refrigerator until you are ready to eat them.