Preheat oven to 350°F and spray two 5x9-inch loaf pans with cooking spray and set aside.
In a large bowl, combine pumpkin, eggs, vegetable oil, vanilla, milk, and sugar.
1 (15oz.) can 100% pumpkin puree, 4 large eggs, 1 cup vegetable oil, 1 tablespoon vanilla extract, ⅔ cup whole milk, 3 cups granulated sugar
In a separate bowl, whisk together flour, baking soda, salt, and spices.
3½ cup all-purpose flour, 2 teaspoons baking soda, 1½ teaspoons salt, 1 teaspoon ground cinnamon, 1 teaspoon ground nutmeg, ½ teaspoon ground cloves, ¼ teaspoon ground ginger
Add the dry ingredients to the wet ingredients and mix until combined.
If using, fold in 2 cups of nuts to the batter.
3 cup chopped walnuts
Pour batter evenly into the two loaf pans and top the loaves evenly with the remaining nuts, if desired. Bake for 50 to 60 minutes until a cake tester comes clean from center.