01 -
Melt the butter in a light-colored saucepan on medium. Stir almost nonstop so it doesn’t burn. It’ll foam up and sizzle around the edges as it melts. After 5-6 minutes, it’ll become golden-brown and smell nutty. Take it off the heat and pour into a bowl that’s heat-safe. Pop it in the fridge for half an hour to cool down.
02 -
Turn your oven on to 350°F (175°C) to preheat and put parchment paper or silicone mats on two baking sheets.
03 -
Whip together the cooled brown butter and dark brown sugar for a few minutes until fluffy and pale. Blot some of the extra water out of the pumpkin puree with paper towels, then stir it in with the vanilla extract.
04 -
Incorporate the flour, cinnamon, oats, baking soda, and salt into the wet mixture, stirring just until it comes together. The dough will feel pretty thick.
05 -
Scoop tablespoon-sized portions (about 32) of dough, and arrange them with 1.5 inches between each on your prepared baking trays. Bake them on the middle rack one sheet at a time for around 8-9 minutes, until the edges are set and the centers still look soft.
06 -
While they’re still hot, press the tops of the cookies gently with a flat-bottomed glass or a measuring cup. Let them sit on the tray for 10 minutes before transferring them to a cooling rack.
07 -
Combine the cream cheese and the rest of the brown butter by beating them together, then mix in the powdered sugar, vanilla, and salt until it’s smooth. Pour the frosting into a disposable piping bag or a heavy-duty resealable bag, and snip off a corner with a 1/2-inch opening.
08 -
Match the cookies into pairs. Pipe a thick layer of frosting on the flat side of one cookie and sandwich it together with its partner. Repeat with the rest.