01 -
Preheat oven to 375°F (190°C) and line a muffin tin with cupcake liners.
02 -
In a bowl, mix the diced rhubarb with granulated sugar and set aside.
03 -
In a separate bowl, whisk together brown sugar, melted butter, milk, eggs, and vanilla extract.
04 -
Add the flour, baking powder, baking soda, salt, and lemon zest to the wet ingredients, stirring until just combined.
05 -
Gently fold in the rhubarb mixture.
06 -
Divide the batter evenly among the muffin cups.
07 -
Bake for 20-25 minutes or until a toothpick inserted into the center comes out clean.
08 -
Allow the muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely.