Method: Preheat oven to 350°F. Grease or line an 8” x 8” pan with parchment paper. Whisk together melted butter and sugar until smooth. Whisk in the egg then Frangelico. Stir in salt and flour. Finally, stir in nuts. Pour into the prepared pan and bake 20 -25 minutes or until set in middle. Cool completely. Spread Nutella over top and refrigerate at least 30 minutes. Slice into 16 squares.