Meanwhile, in medium bowl, beat remaining 3 oz cream cheese, the powdered sugar, 1 teaspoon milk and remaining 1/2 teaspoon vanilla with electric mixer on medium speed until smooth and creamy. Beat in up to 1 additional teaspoons milk if necessary to make spreadable. Spread evenly over cooled bars. Sprinkle with remaining candy sprinkles. Cut into 4 rows by 4 rows.