In a small bowl mix the ground cinnamon and brown sugar until combined. Set aside.
Preheat your oven to 325, with cooking spray, generously spray the sides and crevices of a large size bread pan. Set aside,
In the bowl of a stand mixer fitted with the paddle attachment, cream the butter and sugar on medium-high for 3 minutes. With a rubber spatula, scrape down the sides and bottom of the bowl.
Add the eggs, one at a time, scraping after each addition.
Add the mashed bananas mix on low, until incorporated!
Next add the flour, baking soda, and salt. Mix on the lowest speed just until combined and there are no flour streaks. Don’t over mix!!!
Pour half of the the banana bread batter into the prepped pan. With the back of the spoon, gently even it out, and make sure the batter gets into all four corners.
Pour the Nutella onto the top of the banana bread batter. Pour the rest of the batter onto the Nutella spread. Spread with the back of the spoon to each corner of the pan.
Generously sprinkle the cinnamon mixture to the top of the banana bread ensuring you cover the top.
Bake for 65-68 minutes, or until a toothpick is inserted and comes out with a little crumbs. Let it cool completely in the pan before transferring onto Nutella on top. Serve and Enjoy!