Preheat oven to 350 degrees Fahrenheit.
Peel ripe bananas and put them in a large mixing bowl, then mash them until creamy.
3 medium bananas
Add melted butter and granulated sugar to a new bowl; whisk together.
1/2 cup butter, 1 cup granulated sugar
Add eggs and vanilla to the same bowl, and whisk all ingredients together.
2 eggs, 2 teaspoons vanilla
Add salt, sour cream, mashed bananas, baking soda, and homemade nutella; combine ingredients.
1 teaspoon kosher salt, 1/2 cup sour cream, 1 teaspoon baking soda, 1/4 cup homemade hazelnut butter or Nutella
Stir in and mix together flour.
1 1/2 cups all-purpose flour
Add 1/2 cup chocolate chunks and chopped hazelnuts, folding them into the batter.
3/4 cup dark chocolate chunks, 1/2 cup chopped roasted hazelnuts
Pour batter into a 9x5 loaf pan and top with more remaining chocolate chunks.
Bake for 55-60 minutes or until a toothpick comes out clean. Let cool in pan for 10 minutes and transfer to a cooling rack.
Slice and enjoy!