In a mixing bowl, combine the first six ingredients. Add egg, egg whites, pumpkin, oil and water; mix well. Transfer to an 11x7x2 inch baking pan coated with nonstick cooking spray. Bake at 350 degrees F for 25-30 minutes or until a toothpick inserted near the middle comes out clean. Cool on a wire rack.
In a mixing bowl, beat cream cheese. Beat in confectioners' sugar, then vanilla and lemon peel. Frost bars. Chill for 15 minutes, then cut. Refrigerate leftovers.
For bars: Beat together eggs and sugar until fluffy and light; gradually add oil and pumpkin. Add the remaining ingredients, and mix thoroughly. Spread batter in ungreased 10x15 inch baking pan. Bake at 350 degrees F for 25-30 minutes. Cool and frost with frosting.
For frosting: Beat all ingredients until smooth. Frost cooled bars.
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