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Preheat oven to 350 degrees.
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Spray an 8-inch round cake pan with nonstick cooking spray.
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Stir flour and lightly measure 1 cup.
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Combine flour, 1/2 cup Splenda, and spices in a large bowl.
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Cut in the margarine using a pastry blender or fork until the mixture resembles small crumbs.
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Measure out 1/2 cup and set aside.
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To the large bowl of flour, add the baking powder, baking soda, buttermilk, molasses, and egg.
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Beat with a spoon or on low speed with a mixer until smooth.
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Spoon into the prepared pan.
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Add the tablespoon of Splenda and teaspoon of cinnamon to the reserved crumb mixture.
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Sprinkle mixture over the top of the cake.
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Bake for 25 minutes or until the center of the cake springs back when touched lightly.