In a double boiler, heat butter and soy milk together over medium heat until butter is completely melted. It will take about 10 minutes to completely melt.
Once melted, add in the chocolate chips and continuously stir until the mixture is shiny and smooth. About another 5 minutes.
Remove from heat and set aside to let cool to pudding like consistency. It will take about 2 - 3 hours to cool to this stage. Stir mixture every 15 - 30 minutes during the cooling process.
NOTE: Do NOT let any drop of water get into the mixture while heating, otherwise bad things will happen.