Preheat oven to 350 F. Line a 9”x3” loaf pan with parchment paper and grease the parts that are exposed.
Sift flour, baking powder and baking soda in a large bowl. Add sugars, chocolate chips, and chopped hazelnuts. Use a hand whisk or a large spoon to blend all ingredients together.
In a separate bowl, beat eggs, add buttermilk and pour the mix into the flour mix. Drizzle in the oil.
Using a hand whisk or a large spoon, mix the ingredients just until they come together. Do not over mix, few lumps are ok.
Pour batter in greased pan and bake for 45-50 minutes or until a toothpick comes out clean from the center of the cake.
Remove from the oven and let cool for about 15-20 minutes before removing from the pan.
Once ready to serve, mix powdered sugar with cinnamon. Add milk and mix. Drizzle on bread and serve.