SPREAD dough on a large cookie sheet and bake according to directions.
BEAT cream cheese until fluffy. Add mayonnaise and Ranch dressing mix. Taste, then add garlic powder and Luzianne Cajun Seasoning, if desired. Spread the mixture over cooled dough.
CHOP the vegetables into small pieces and mix well. Spread evenly over the cream cheese mixture.
COVER and refrigerate for at least 1 hour. Cut into squares and serve chilled.