Preheat the oven to 350 degrees. Lightly grease a 10" skillet.
In a bowl whisk together the flour, baking soda and salt. Set aside.
In a separate bowl, cream together the brown sugar, peanut butter, butter and granulated sugar until light and creamy. Add the egg and vanilla extract and mix until combined.
Add the dry ingredients, mixing only until the flour is just incorporated. Use a rubber spatula to mix in the chocolate chips and pretzels.
Put ⅓ of the dough in the skillet and smooth. Drop tablespoons of Nutella over the dough. Add another ⅓ of dough and more Nutella. Add the remaining dough.
Bake for 15 - 20 minutes and allow it to cool at least 10 minutes before slicing and eating.
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