Add warm milk to a large bowl with instant yeast and honey. Whisk until the honey is dissolved and the yeast is combined. Add the melted butter, egg, sourdough discard, all-purpose flour, and salt to the same bowl. Stir well with a wooden spoon until a shaggy dough forms. Turn this rough dough out onto your countertop and begin kneading. You will knead for about 4 to 5 minutes until the dough becomes smooth. Form the dough into a ball, and place it into a lightly greased, large glass bowl.
