Heat oven to 325ºF. Coat a 9-by-5-by-3-inch loaf pan or a standard 12-cup muffin tin with butter and flour.
Take the flour, cinnamon, baking soda, baking powder, and salt for a spin in your food processor, then more them to a large mixing bowl.
In a separate bowl, mix the sugar, vegetable oil, eggs, and vanilla. Combine both mixtures and fold inDon't worry if there are a few lumps. the shredded pumpkin and pumpkin seeds. Once all the ingredients are incorporated, pour into the prepared loaf pan or muffin tin.
Bake for 1 hour and 25 minutes. At this point, a knife inserted into the middle of the loaf should come out clean and a digital instant-read thermometer inserted into the center should read 200°F. Cool for 15 minutes and turn out onto a cooling rack. Cool completely. For muffins, temperature should also be 325ºF, but bake for 30 minutes.