To make the chocolate spheres,melt the chocolate in the microwave for about two minutes, stirring every 30 seconds so that the chocolate doesn't burn.
Coat the moulds with a little bit of cooking spray or oil, rubbing it with a pastry brush or paper towel so that it does not pool inside the domes. Cover a plate with some parchment paper and set aside. Using a metal spoon or small spatula, coat each ball with one layer of chocolate then flip it upside down onto the plate. Working quickly, repeat with the rest of the moulds and place in the fridge to harden, about five minutes.
Once the first layer is hardened, repeat step two a couple more times, adding about three layers of chocolate in total. Once your third layer has hardened, place the chocolate filled moulds in the freezer for an hour to set the chocolate a bit more and help it pull away from the edges of the mould (this is especially important if working with plastic moulds).
After an hour, take the moulds out of the freezer. Using a butter knife, rim the edjes of the moulds to loosen up the chocolate and using your fingers, slowly pry/shift the chocolate dome out of the mould. If using silicone, this process with be much easier as you can squish the mould to get the chocolate out. Place your chocolate domes on a plate and set aside.