Mix butter and cream cheese until smooth.
Add brown sugar, powdered sugar, salt, and vanilla to the butter and cream cheese. Then mix well.
Chop Cadbury eggs and save some for garnishing.
Fold in the remainder of the chopped Cadbury eggs.
Garnish top with reserved chopped Cadbury eggs.
Chill until ready to serve.
Serve with graham crackers, vanilla wafers, pretzels, or fruit.