01 -
Set oven to 190°C. Line a baking sheet with parchment paper.
02 -
In a large bowl, beat brown sugar, butter, vanilla extract, and egg with an electric mixer until smooth and fluffy.
03 -
Add flour, cinnamon, salt, baking soda, and baking powder to the bowl. Mix until a cohesive dough forms.
04 -
Gently stir diced rhubarb into the dough until evenly distributed.
05 -
Using a 2.5-centimetre cookie scoop, form dough into balls and arrange on prepared baking sheet with space between each.
06 -
Bake for 12 to 14 minutes until cookies are set and lightly golden on the edges.
07 -
Cool on baking sheet for 2 minutes, then transfer to a wire rack to cool completely.