Whisk pumpkin, brown sugar, granulated sugar, oil, eggs, buttermilk, and vanilla until smooth. Stir in flour, pumpkin pie spice, baking powder, baking soda, and salt just until combined.
Coat two 9-by-5-inch loaf pans with baking spray. Divide batter in half. Put one half in a pan and top with pumpkin seeds. Fold chocolate chips into the remaining batter, place it in the second pan, and smooth both tops.
Bake 60 to 65 minutes, until a tester comes out clean. Cool in pans 10 minutes, turn loaves onto a rack, and cool completely.
Recipe Notes
Adapted from The Pioneer Woman. Original recipe: https://www.thepioneerwoman.com/food-cooking/recipes/a44068265/pumpkin-bread-recipe/