running, add the warm milk/butter mixture and the pureed pumpkin.
continue mixing, adding additional flour as necessary, until the dough pulls away from the sides of the bowl. don't over flour or the dough will be dense and tough.
knead until the dough is smooth, elastic, and just slightly sticky (about 6 minutes).
place the dough in a large lightly greased bowl. cover the bowl with lightly greased plastic wrap and let it rise until doubled, about 1 hour.
while the dough is rising, make the filling by combining the brown sugar, white sugar, cinnamon, and nutmeg in a bowl. set aside.
when the dough has doubled in size, lightly punch it down and divide 