PREHEAT oven to 350° F. Grease thirty-six 2 1/2-inch muffin cups or line with paper bake cups.
COMBINE all-purpose flour, whole-wheat flour, baking soda, baking powder, cinnamon and salt in medium bowl. Combine eggs and sugar in large bowl. Add pumpkin and oil; mix well. Stir in flour mixture until moistened. Stir in morsels. Spoon batter into prepared muffin cups.
BAKE for 20 to 25 minutes or until top springs back when lightly touched. Cool in pans on wire racks for 5 minutes; remove from pans.