Marble Cheesecake Bars

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   ["Heat oven to 350 (dark nonstick pan 325). Grease rectangular pan, 13x9x2 inches. Reserve 1 cup of dry cake mix. Blend remaining dry cake mix, margarine, and 1 egg on low speed until dough forms. Pat in bottom of pan. Bake until golden and until crust falls away from sides of pan., 15 to 20 minutes. Beat cream cheese and sour cream until smooth. Blend reserved cake mix, water, sugar, and 2 eggs into cream cheese mixture on low speed, scraping bowl occasionally, 2 minutes. Blend reserved cream cheese mixture and marbling mixture in small bowl on low speed. Drop dark batter by generous tablespoonfuls randomly in 6 to 8 mounds onto yellow batter. Cut through batter with knife in ""s"" shaped curves in one continuous motion. Turn pan 1/4 turn and repeat for marbled effect. Bake until set and cake springs back when touched lightly in the center, 31 to 36 minutes. Run knife along edges of cake to prevent cracking; cool completely. Refrigerate until firm. Cut into 2 1/4 x 1 inch bars. Top with fruit pie filling if desired. Refrigerate any remaining bars. Makes 48 bars."]

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