*semi-sweet chocolate chips
*a zip-lock plastic bag or piping bag
*cookie cutters to draw around (or free-hand it!)
*small piping tip (optional)
I don't want to make this harder than it is- basically, you just melt chocolate in a zip-lock bag, snip a corner off, and squeeze out a design onto parchment paper. But I like to know details on projects I attempt, so here are a few more specifics:
Draw the designs you want to make on the parchment paper. I drew around heart-shaped cookie cutters. Turn the paper over. You'll still be able to see the designs, but you won't get pencil or ink on the chocolate.
If using the piping tip, cut a small hole in one of the bottom corners of the zip-lock bag and push the tip into the hole from the inside.
Put about 1/4 cup chocolate chips in a zip-lock bag. Push them, in a single layer, into one of the bottom corners (into the piping tip corner, if using). Zip top closed. Microwave at 50% power for a few seconds at a time, lightly kneading the chocolate to mix it, until almost completely melted. Lightly knead the chocolate through the bag until smooth. Keep the chocolate in the corner as much as possible. You may want to hold the bag with a kitchen towel or pot holder- it gets very warm.
Now you'll want to fill the inside space of the design with loops or zigzags. Make sure there are lots of intersections in the lines- this is what will give your design strength and stability.
What worked best for me was to use the piping tip to trace the outlines of all the hearts. Then I used a second bag of chocolate with the corner snipped off (no piping tip) to go back and fill the hearts in with zigzags and swirls.