01 -
Heat up your oven to 375°F (190°C) and place parchment paper or a silicone mat on your baking tray.
02 -
Mix the butter, brown sugar, and egg in a big bowl using a hand or stand mixer until smooth and fluffy.
03 -
Stir together the flour, cinnamon, baking soda, baking powder, and salt in the same bowl. Mix it slowly so it just comes together.
04 -
Gently stir in the tiny pieces of rhubarb. Scoop 1-inch balls of dough and set them on the prepared baking tray.
05 -
Bake the dough balls for about 12–14 minutes, or until the bottoms are light golden brown and the cookies are set.
06 -
Let cookies sit on the tray for about 5 minutes, then move them over to a rack to finish cooling completely.