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Preheat oven to 350°F Spray 10 inch tube pan or non-stick Bundt pan with cooking oil spray.
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Sift cake flour, baking powder, and soda into medium bowl.
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In large bowl, cream softened butter with electric mixer on medium speed.
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Add Splenda Granular and egg. Mix until smooth.
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Add egg substitute and vanilla; mix 30 seconds.
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Add applesauce and 1/2 cup sour cream; mix until smooth.
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Add sifted flour mixture and beat at medium speed just until smooth.
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Add remaining sour cream and blend. Set aside.
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Spice Filling.
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Place 1 cup cake batter in a small bowl.
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Add brown sugar and cinnamon; blend.
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Place 1/2 remaining cake batter into prepared pan. Top with spiced batter filling.
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Swirl with knife.
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Top with remaining batter.
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Bake 50 to 60 minutes or until toothpick inserted in center comes out clean.