Place molds onto small baking sheet.
Place candy melts into a microwave-safe bowl and microwave according to package. Then, spoon a little of the melted candy into the mold.
Use the back of the spoon to spread the candy evenly around the bottom and sides of the mold. You want it to be thick, but not too thick. It's okay if some of the chocolate goes over the edge of the mold.
Once molds are completely filled, place in the freezer for 5 minutes, or until completely solid.
Microwave a small plate until it's warm to the touch, 25-30 seconds. Place open side of shell half onto the plate and move gently around until the edge is smooth.
Place into a cupcake liner.  Then, spoon a little of the hot chocolate mix into the shell. Top with marshallows and eyeball sprinkles.
Grab another shell half, warm it on the plate to create a smooth edge, and place on top of the filled shell.
Use extra melted candy to seal the seam of the cocoa bomb.
Add a drop of melted candy to the top of the cocoa bomb.  Then, place a candy wafer on top.
Repeat with the rest of the candy shell halves until all of the cocoa bombs are made.
Store hot cocoa bombs in a sealed container in the fridge or freezer until ready to use or gift.