01 -
Preheat oven to 350°F (180°C). Line a baking tray with parchment paper.
02 -
In a mixing bowl, combine rolled oats, all-purpose flour, and brown sugar until evenly mixed.
03 -
Pour the melted butter into the dry mixture and stir until a soft dough forms.
04 -
Gently fold the chopped rhubarb into the dough, ensuring even distribution without overmixing.
05 -
Scoop portions of dough onto the prepared baking tray and flatten slightly. This will yield approximately 12 cookies.
06 -
Bake in the preheated oven for 12 to 15 minutes, or until the edges turn golden brown.
07 -
Allow cookies to cool slightly on the tray; they will firm up as they set.