Preheat the oven to 350°F (175°C). Grease a 9×5-inch loaf pan or line it with parchment paper.

Mix the wet ingredients: In a large bowl, whisk together pumpkin puree, vegetable oil, eggs, granulated sugar, and brown sugar.

Prepare the dry ingredients: In a separate bowl, whisk flour, baking soda, baking powder, salt, and spices.

Combine: Gradually add the dry ingredients into the wet ingredients and mix until just combined.

Create the cinnamon swirl: In a small bowl, mix cinnamon and sugar. Pour half of the batter into the loaf pan, sprinkle half of the cinnamon sugar mixture, and top with the remaining batter. Finish with the remaining cinnamon sugar.

Bake for 55-60 minutes or until a toothpick comes out clean. Cool in the pan for 15 minutes before transferring to a wire rack.