Heat-treat cake mix by baking at 350°F for 5 minutes or microwaving in short intervals; cool completely
Mix cake mix, cream cheese, butter, vanilla, and salt until smooth and creamy
Fold in sprinkles gently until evenly distributed
Chill mixture for 30–45 minutes until firm
Scoop about 1 tablespoon and roll into balls; place on parchment-lined tray
Chill rolled truffles for 30 minutes or freeze for 15 minutes
Melt white chocolate chips with coconut oil in short bursts, stirring until smooth
Dip each truffle in chocolate, tap off excess, and return to parchment
Add toppings immediately and chill 20–30 minutes until set