Place the chocolate chips in a medium heat-safe bowl. Place the bowl over a saucepan with 1 inch of water in the bottom and heat over medium heat. Stir constantly with a rubber spatula until the chocolate is completely melted and smooth. Stir in the oil and remove from the heat.
Line a baking sheet with parchment paper. Dip each chip halfway into the chocolate coating, allowing the excess to drip off back into the bowl. Place the coated chip on the parchment-lined tray and continue with the remaining chips. Garnish with the sprinkles or salt of your choice. Refrigerate the chips until the chocolate is set, about 15 minutes. Serve, or store in the refrigerator for up to 3 days before serving.