Heat-treat cake mix at 350°F for 5 minutes; cool completely
Beat cream cheese, powdered sugar, vanilla, and salt until smooth
Mix in cake mix and crushed cookies until a thick dough forms
Add milk or cream gradually until mixture rolls easily
Fold in sprinkles gently
Chill mixture for 45 minutes
Roll into 1-tablespoon balls; place on parchment
Chill 30 minutes or freeze 15 minutes
Melt chocolate with coconut oil in short intervals, stirring until smooth
Dip truffles, tap off excess, decorate immediately
Chill 20–30 minutes until fully set