Chokladchip-Nutellafyllda havregrynskakor

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1. 1
   Preheat the oven to 350° F. Line a baking sheet with parchment paper.
2. 2
   Add the butter to a skillet set over medium heat. Cook until the butter begins to brown, about 3-4 minutes. Remove from the heat and transfer to a heatproof bowl. Let cool 5 minutes or so.
3. 3
   To the brown butter, mix in the brown sugar, granulated sugar, eggs, and vanilla, mixing until smooth. Add the flour, oats, baking soda, and salt. Gently fold in the chocolate chips.
4. 4
   Roll the dough into 1/4 cup balls and place 2 inches apart on the prepared baking sheet. Cut each dough ball in half, then flatten the dough down to make room for the Nutella. Add 1 rounded teaspoon to the center of each cookie, then cover with the top cookie half, enclosing the Nutella. Gently flatten each dough ball down. Bake 8 minutes. Remove from the oven, rotate, and tap the baking sheet on the counter 1-2 times to flatten. Bake another 4-6 minutes or until the cookies are just beginning to set on the edges.
5. 5
   Let the cookies cool on the baking sheet. They will continue to cook slightly as they sit on the baking sheet. Sprinkle with sea salt, eat warm or store in an airtight container for up to 4 days.