In a light-colored saucepan, melt the butter over medium heat. Stir frequently for about 5-7 minutes until golden brown.

Scoop dollops of Nutella, about 1 tablespoon each, onto parchment paper and freeze for 15-20 minutes.

In the bowl with cooled brown butter, mix in the light brown sugar until smooth. Then beat in the egg, sour cream, and vanilla extract.

In a separate bowl, whisk together the flour, baking soda, and fine salt. Gradually mix this into the wet ingredients.

Fold in the chocolate chips until just combined.

Portion out the dough and chill in the refrigerator for at least 30 minutes.

Preheat oven to 350°F. Flatten each dough ball, place a frozen Nutella scoop in the center, and wrap the dough around it.

Arrange on a baking sheet and bake for 9-10 minutes, until edges are golden.

Sprinkle flakey sea salt on top while warm. Cool on the pan for 15 minutes before transferring to a wire rack.