Preheat oven to 350°. Combine first 5 ingredients in a large bowl, stirring well with a whisk. Lightly spoon flour into dry measuring cups; level with a knife. Combine flour, cinnamon, salt, and baking soda in a medium bowl, stirring well with a whisk. Add flour mixture to pumpkin mixture, stirring just until moist. Stir in chocolate chips. Spoon batter into 2 (8 x 4-inch) loaf pans coated with cooking spray.