Preheat oven to 375 degrees F. Spray a 10 inch cast iron skillet with non-stick cooking; set aside.
In a large bowl, add butter, brown sugar and sugar. Stir until combined.
Add egg and vanilla, stir until just incorporated.
Add flour, salt, baking powder and coffee granules to a bowl and whisk together.
Slowly add the dry ingredients into the wet ingredients and stir until just incorporated.
Stir in hazelnuts and chocolate chips.
Transfer cookie dough to prepared skillet. Spread into an even layer.
Bake for 25-30 minutes, or until a toothpick interested comes out clean.
Allow to cool for 10 minutes, then cut into pieces and add toppings.