Heat oven to 350. Spray a 9 x 13" pan w/ cooking spray. In bowl, combine cake mix, 1 egg and oil, mix until crumbly. Set aside 1 cup of mix. Lightly pat remaining mix into bottom of pan, bake 15 min, or until light brown. In bowl, beat together 1 egg, cream cheese, sugar and lemon juice until smooth. Spread over baked crust. Sprinkle w/ reserved cake mix. bake 15 min or until light brown. Cool. Cut into squares.