In a skillet over medium heat, melt the butter and add the pecans. Toast them for 3–5 minutes, stirring frequently until they’re golden and fragrant. Remove from heat and let them cool completely.
In a microwave-safe bowl or using a double boiler, melt the chocolate chips with the oil (if using) in 20-second intervals, stirring between each until smooth and fully melted.
Add the cooled toasted pecans into the melted chocolate and stir to coat each one evenly. Using a fork or slotted spoon, lift them out and shake off excess chocolate.
Place the coated pecans on a baking sheet lined with parchment paper. Sprinkle with a little sea salt if desired. Chill in the refrigerator for 30 minutes or until the chocolate is fully set. Once hardened, transfer to an airtight container.