Whisk flour, baking soda, baking powder and salt together in a large bowl.
In a medium bowl , whisk melted butter and sugar until smooth. Add eggs, milk. and vanilla and whisk!
Add the wet into the dry ingredients and mix just untill combined. Fold in the chopped rhubarb!
Divide equal amount of batter among the liners and top with more fresh rhubarb!
Bake at 375F for 18-20minutes.