Made with chocolate chips and oatmeal, these refrigerator cookies are pretty much slice and bake! Whip up a few batches, keep them in the freezer or refrigerator and whenever you have a cookie craving, pull these out to bake up!
In a medium skillet, melt the butter over medium heat. Allow to bubble and foam. After about 5 minutes, the foaming will lessen and the bottom of the skillet will show brown solids with the butter smelling nutty and looking golden. Scrape into a bowl and cool.
Combine the cooled brown butter and sugars until evenly mixed, 3 minutes. Add the egg and vanilla and mix to combine. Scrape sides of the bowl to ensure even mixing. Add flour, baking soda, and salt. Mix just to combine. Add rolled oats and chocolate chips. Mix to incorporate and finish by hand to ensure it is well mixed.
Divide dough in half and shape each half into a log. Use parchment paper or plastic wrap to compact the dough. Do not worry about over compacting. Once in tight uniform logs, twist the ends and place in the refrigerator or airtight container until firm, 2 hours.
When ready to bake, preheat the oven to 350°F. Slice prepared cookies into ¼-inch thick and place on parchment-lined baking sheet. Sprinkle with Malden sea salt. Bake until the edges are set and the centers are just soft, 10-12 minutes. Remove from the oven and cool on pan for 5 minutes. Finish cooling on a wire rack.