In a large bowl, whisk together the warm milk, yeast, sugar, discard, eggs, and softened butter; you can also use a stand mixer. This works best if the ingredients are at room temp.
Next, add the flour and salt, and use a wooden spoon to mix the dough until it becomes too difficult to stir.
Dump the dough onto a surface to finish incorporating and knead by hand for 10 minutes. 6-8 minutes if using a stand mixer. The dough should look smooth and elastic.
Cover the dough with plastic wrap and allow to rise until double in size. This can take around 60-90 minutes.
Once doubled, punch down the dough and shape 15 equal-sized dough balls.
Place each dough ball into a greased 9x13 baking dish. A 3x5 pattern works well.
Cover again and allow to rise for the second time 45-60 minutes or until very puffed up.
Preheat oven to 375F and bake rolls for 13-15 minutes or until golden brown. Brush melted butter over the tops of warm rolls. Serve.