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Preheat oven to 400°.
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Combine flour and next 5 ingredients (flour through chocolate) in a medium bowl; stir well with a whisk.
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Make a well in center of mixture.
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Combine milk, butter, and egg; stir well with a whisk.
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Add to flour mixture, stirring just until moist.
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Spoon about 1 tablespoon batter into each of 12 muffin cups coated with cooking spray.
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Spoon 2 teaspoons preserves into center of each muffin cup (do not spread over batter); top with remaining batter.
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Sprinkle evenly with 1 tablespoon sugar.
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Bake at 400° for 22 minutes or until muffins spring back when touched lightly in center.
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Remove from pan. Cool completely on wire rack.