Line a baking sheet with parchment paper or wax paper and set aside.
In a microwave-safe bowl, combine chocolate chips and vegetable oil. Microwave in 30-second increments, stirring between each, until completely melted and smooth.
Pour the melted chocolate into a tall glass and dip each pretzel rod about ⅔ of the way into the melted chocolate, gently swirling to coat evenly. Let excess chocolate drip off, then gently tap or rotate the rod to avoid pooling.
If using toppings, immediately roll or sprinkle them onto the chocolate-coated part of the pretzel rod before the chocolate sets.
Place the coated pretzel rod onto the prepared baking sheet. Repeat with the remaining pretzels and toppings.
Let the pretzels sit at room temperature until the chocolate is set, about 1 hour. To speed things up, place the baking sheet in the refrigerator for about 20 minutes until the chocolate is firm.
Once fully set, transfer the pretzel rods to an airtight container. Serve or store at room temperature for up to 2 weeks.