1/2 cup reduced-fat mayonnaise
1/2 cup reduced-fat sour cream
1 (0.6-ounce) envelope Italian dressing mix
1 (16-ounce) can quartered artichoke hearts, drained
1/4 cup shredded Parmesan cheese
Process first 3 ingredients in a food processor until blended, stopping to scrape down sides. Add artichokes and cheese, pulsing 5 to 7 times or just until artichokes are coarsely chopped.
Spoon mixture into a serving bowl; cover and chill 1 hour.