Heat oven to 350°F. Combine sour cream, cream cheese and in small bowl. Beat on medium speed, scraping bowl often, until smooth (1 to 2 minutes).

Spread evenly into 9-inch pie pan. Spread with pizza sauce. Top with pepperoni and green onions. Bake for 10 to 12 minutes or until heated through.

Top with cheese. Continue baking for 4 to 5 minutes or until cheese is melted. Serve with breadsticks or corn chips.