Preheat oven to 350 degrees. Combine all dry ingredients. Combine oil, eggs, & pumpkin in separate bowl.
Add wet ingredients to dry mixture stirring until just moist. Stir in chocolate chips if using. Scoop batter into 28 muffin cups coated with cooking spray or lined with paper liners.
Bake at 350 degrees for 18-20 mins or until inserted toothpick comes out clean.