Preheat your oven to 350°F (175°C). Grease and flour two large loaf pans, each about 9 by 5 inches, to ensure your bread releases easily after baking.

In a large bowl, whisk together the all-purpose flour, baking soda, salt, and pumpkin pie spice blend until thoroughly combined. This step ensures even distribution of the leavening agents and spices.

In another large bowl, use a mixer to blend together the pumpkin purée, 3 cups of granulated sugar, oil, water, eggs, and vanilla extract. Mix until the ingredients are smooth and well incorporated. I like to scrape down the sides of the bowl once or twice to ensure everything gets evenly mixed.

Gradually add the dry ingredients from Step 2 into the wet mixture from Step 3. Stir gently, using a spatula or mixer on low speed, until the ingredients are just blended—avoid overmixing to keep the bread tender.

In a small bowl, stir together 1/2 cup of granulated sugar and 2 tablespoons of ground cinnamon until well combined. This mixture will be used to create a cinnamon-sugar swirl in your bread.

Divide about three-quarters of the batter from Step 4 evenly between the two prepared pans. Sprinkle roughly three-quarters of the cinnamon sugar mixture from Step 5 over the batter in both pans. Use a butter knife to gently swirl the cinnamon sugar into the batter for a marbled effect. Then, divide the remaining batter between the pans, spreading evenly over the first layer, and finish by sprinkling the tops with the remaining cinnamon sugar mixture. I like to make a little extra swirl on top for a pretty presentation and flavor burst.

Bake the loaves in the preheated oven for 60 to 65 minutes, or until a toothpick inserted in the center comes out clean. Let the bread cool in the pans for 5 to 10 minutes, then carefully remove and transfer to a wire rack to cool completely before slicing. This rest time lets the flavors settle and prevents the bread from breaking apart.