In a large bowl, stir together cake mix, whipped topping and yogurt until combined.
Transfer to a serving bowl and refrigerate for at least 15 minutes.
Top with sprinkles before serving with crackers or cookies.
Notes
Cream Cheese and Cool Whip: Thicken the dip by adding some cream cheese or raw flour. Just add the cream cheese to a large mixing bowl and mix to make a rich, creamy dip. You can also use yogurt instead of the cream cheese.
Pudding: In addition to the raw cake mix, flavor the dip with different varieties of pudding mix or vanilla extract.
Different Flavors: You can make different flavors of dip for different holidays. For instance, you can make peppermint dip for Christmas, or pumpkin dip for Halloween.