In large bowl, break up cookie dough. Beat in eggs, one at a time, with electric mixer on medium speed until blended. Spread in pan. In small microwavable bowl, microwave frosting on High 10 to 20 seconds or until just melted. Drizzle frosting over batter. Pull tip of knife through batter in wide curves; turn pan and repeat for marbled design. Bake 25 to 35 minutes or until edges are set but center still jiggles slightly.