Heat oven to 350°F. Beat sour cream, cream cheese and Italian seasoning in small bowl until smooth.
Spread sour cream mixture in shallow 9-inch quiche dish or 9-inch pie plate. Spread with pizza sauce. Top with pepperoni and green onions.
Bake for 12 to 14 minutes or until heated through. Top with cheese. Continue baking for 4 to 5 minutes or until cheese is melted. Serve with breadsticks.