01 -
Preheat oven to 375ºF.
02 -
Cream brown sugar, butter, and egg together until smooth.
03 -
Whisk together all-purpose flour, cinnamon, salt, baking soda, and baking powder.
04 -
Gradually mix the dry ingredients into the wet mixture to form a dough.
05 -
Gently fold in the finely diced rhubarb.
06 -
Scoop dough onto a greased cookie sheet.
07 -
Bake for 12-14 minutes until golden.
08 -
Cool on the baking sheet for 5 minutes, then transfer to a wire rack.