Preheat oven to 350°F. Spray a 9 x 5-inch loaf pan with non-stick spray and set aside.

In a bowl, cream together butter, sugars, eggs, and vanilla.

In a small bowl, combine 3 teaspoons of cinnamon and 1/2 cup sugar.

In a separate bowl, combine flour, salt, baking powder, and baking soda.

Carefully add dry ingredients to wet ingredients. Stir in the pumpkin until completely incorporated.

Pour 1/4 of the batter into the prepared loaf pan. Sprinkle with 1 tablespoon of the sugar mixture.

Top with another 1/4 of the batter and sprinkle with another tablespoon of the sugar mixture.

Reserve 1/4 cup of the remaining cinnamon sugar.

Repeat the layering twice (you will have 4 layers of batter).

Swirl batter with a skewer or a knife.

Combine the reserved cinnamon-sugar mixture, flour, brown sugar, and butter. Sprinkle over the bread.

Bake bread for 50-55 minutes or until a toothpick inserted in the center comes out clean or with loose crumbs.

Remove to a cooling rack for 10-15 minutes.

Remove from pan and let cool completely.