Space out half of your pretzels on a baking sheet lined with parchment paper or a silicone baking mat, then set aside.
Heat-treat your cake mix by pouring it into a microwave safe bowl and microwaving for 90 seconds, stirring every 30 seconds, or until it reaches 160 degrees F.
In a medium mixing bowl, combine the heat-treated cake mix, softened butter, and milk then mix to form a dough consistency.
Roll the dough into balls roughly 1 inch in size, then place one dough ball on top of each pretzel twist.
Sandwich each dough ball with another pretzel twist, then set aside.
In a microwave safe bowl, combine white chocolate chips with vegetable oil. Microwave in 30 second intervals, stirring in between, until melted and smooth.
Dip each pretzel bite halfway into the melted chocolate, then return to your prepared baking sheet and immediately top with rainbow sprinkles.
Transfer to the fridge to let the chocolate set before enjoying!