Brown Butter: Melt butter until golden brown, cool completely.
Mix: Beat sugars with butter, add egg and vanilla. Mix in dry ingredients.
Layer: Press half dough in pan, spread with Nutella, top with remaining dough.
Air Fry: Cook at 350°F / 176°C for 10-12 minutes until done.
Finish: Cool before dusting with confectioners sugar.
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