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Preheat oven to 375°.
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Combine the cream cheese and preserves; stir with a whisk.
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Lightly spoon flour into dry measuring cups; level with a knife.
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Combine flour, sugar, baking powder, poppy seeds, baking soda and salt in a medium bowl; make a well in center of mixture.
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Combine buttermilk, oil, egg whites, and egg; stir well with a whisk.
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Add to flour mixture, stirring just until moist.
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Spoon the batter into 12 muffin cups coated with cooking spray, filling one-third full.
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Top each with about 1 teaspoon cream cheese mixture, divide the remaining batter evenly over the cream cheese mixture.
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Bake at 375° for 25 minutes or until muffins spring back when touched lightly in center.
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Remove the muffins from pans immediately, and place on a wire rack.