Preheat your oven to 350 degrees, and generously spray an 8 inch loaf pan with cooking spray. Sprinkle the bottom and all sides with granulated sugar, and shake out any excess. Set aside.
In a large bowl, beat together the sugar and butter until fluffy. Beat in the eggs, vanilla, and mashed banana and mix until combined.
In a medium bowl, stir together the flour, baking soda, salt, and cinnamon. Add the dry ingredients into the wet in three additions, mixing well between each addition, and reserve about 1 tablespoon of the flour mixture. Toss the chopped pistachios in the reserved flour, and fold into the batter.
Pour the batter into your prepared pan and spread evenly. Bake for 60-65 minutes, or until a tooth-pick comes out clean. Cool and enjoy!