Combine the sweetened condensed milk with flaked coconut in a separate bowl. Remove the crust from the oven and spread the mixture evenly over it.
Remove the pan from the oven and evenly drizzle the melted semisweet chocolate chips over the coconut layer. Allow the bars to cool until the chocolate hardens, about 1 hour.
Once set, cut the slab into squares. Cut the bars before the chocolate hardens completely; otherwise, it may crack when cutting. Store leftovers in an airtight container in the refrigerator.