Preheat the oven to 350 degrees F. Grease a 9x9 baking dish.
Whisk the hazelnuts, chocolate chips, cinnamon, and 2 tbs of the raw sugar in a small bowl. Set aside.
Beat the butter and 3/4 cup sugar in the bowl of your stand mixer until creamy. Scrape down the sides and add the eggs one at a time. Add the vanilla and mix to combine scraping down the sides again if needed.
Whisk the flour, baking soda, and salt in a bowl. Alternating with the yogurt, mix in the flour mix and yogurt until completely combined. The batter will be thick.
Smooth half of the batter into the prepared pan and sprinkle with half of the hazelnut mix.
Smooth the remaining batter over the top and sprinkle with the remaining hazelnut mixture.