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Preheat the oven to 400 degrees.
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Spray six large 3" muffin cups with no-stick spray and set aside.
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In a large bowl, stir together the all-purpose flour, whole-wheat flour, sugar, baking powder and orange peel.
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Make a well in the center of the mixture.
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In a small bowl, beat the egg whites until foamy.
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Stir in the buttermilk and applesauce.
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Add the buttermilk mixture to the flour mixture and stir just until moistened.
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Fold in the chocolate chips.
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Spoon the batter into the prepared cups, filling each 3/4 full.
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Bake for 15 to 17 minutes or until a toothpick is inserted in the center comes out clean.
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Cool the muffins in the muffin cups for 5 minutes.
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Then remove the muffins and cool on a wire rack.