Using the double boiler method: Add the chocolate and oil to a large, heat-proof bowl. Fill a pot with 2 inches of water and bring to a simmer on the stove. The pot needs to be smaller than the bowl. Place the bowl with the chocolate over the simmering water. The steam that's trapped between the two bowls will melt the chocolate. Ensure that the bowl your chocolate is in is heat-proof and not touching the water. Also make sure that there's no water dripping into the chocolate!