Heat oven to 375°F. Line 8-inch square pan with cooking parchment paper.
Remove cookie dough from package; let stand at room temperature about 5 minutes.
In large bowl of stand mixer with paddle attachment, break up cookie dough. Add cream cheese; beat on low speed until blended. Add carrots, cinnamon and egg; stir to combine. Fold in walnuts. Spoon mixture into pan; spread evenly.
Bake 27 to 29 minutes or until toothpick inserted in center comes out clean. Do not overbake or bars will become dry. Remove from oven; cool in pan on cooling rack about 45 minutes.
Spread cream cheese frosting over cooled bars. Cut into 4 rows by 3 rows or 4 rows by 4 rows.