In large bowl, beat eggs with electric mixer on high speed about 5 minutes or until thick and lemon colored. Add cake mix, water, lemon juice, oil and 2 teaspoons lemon peel. Beat on low speed 30 seconds, then on medium speed 1 minute, scraping bowl occasionally. Pour 3 1/4 cups batter into foil-lined pan; spread evenly. Divide remaining batter among muffin cups.