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Preheat oven to 350°F Spray a 10-inch tube pan (angel food pan) or nonstick bundt pan with cooking spray.
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Set aside.
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Sift the cake flour, baking powder, and soda into a medium-sized mixing bowl.
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In a large mixing bowl, cream the butter with an electric mixer.
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Add SPLENDA® Granular and egg. Beat until smooth.
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Add the egg substitute and vanilla.
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Beat briefly to incorporate.
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Add applesauce and half of the sour cream.
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Beat until smooth.
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Add the sifted flour mixture and beat at medium speed just until smooth.
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Add remaining sour cream and blend just until incorporated and batter is uniform.
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Set aside.
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Make Filling: Place 1/4 of cake batter in a small bowl.
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Add brown sugar and cinnamon. Stir well.
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Place 1/2 of the remaining cake batter into prepared pan.
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Top with filling.
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Swirl with knife.
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Top with remaining batter.
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Bake in preheated 350° F oven 50-60 minutes or until a toothpick inserted near the center comes out clean.