Combine chocolate and cream in a microwave safe bowl.
Heat in 15 second bursts in the microwave, stirring well after each, until melted and smooth.
Cover with plastic wrap, making sure it is touching the surface of the chocolate.
Refrigerate until thickened, about an hour.
Heat oven to 400℉/204℃.
Line 2 sheet pans with parchment paper. Set aside.
Working with 1 sheet of puff pastry at a time, unfold onto work surface.
Flatten seams.
Use a 3-inch cutter to cut out shapes.
Repeat with second sheet of puff pastry.
Re-roll scraps, if desired.
Place half of the hearts on prepared pan.
Top each with 1½ teaspoons chocolate, leaving ¼ inch border around the edge.
Brush borders with egg wash.
Top with other half of hearts.
Press to seal. (You can use a fork to make sure they are sealed all the way around.)
Brush tops with egg wash.
Bake for 18 minutes, or until golden brown.