Preheat oven to 350 degrees F (175 degrees C). Spray two 9×5-inch loaf pans with cooking spray.
Beat pumpkin puree, white sugar, brown sugar, eggs, vegetable oil, vanilla extract, and pumpkin pie spice together in a bowl; add flour and beat until batter forms. Fold chocolate chips into batter; divide between the 2 prepared loaf pans.
Bake in the preheated oven until a toothpick inserted in the center comes out clean, about 1 hour. Cool bread in pans for 15 minutes before removing.
Leave out chocolate chips for plain pumpkin bread
Substitute 1 cup chopped walnuts or pecans in place of chocolate chips.
For muffins, divide batter into 24 muffin cups and bake until toothpick comes out clean, 13 to 15 minutes.
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