Proof yeast in warm water, milk, and sugar in the bowl of a stand mixer.
½ cup warm water, 1 tablespoon active dry yeast, 4 tablespoons sugar, 1 cup whole milk
Add the sourdough discard, room temperature butter, flour, and salt. Turn the stand mixer onto the lowest setting using a dough hook and let the dough mix and knead for 8-10 minutes.
⅓ cup sourdough discard, 2 tablespoons unsalted butter, 4 ½ cups all-purpose flour , ½ tablespoon salt
Once the dough is soft and kneaded, move it to an oiled bowl (to prevent the dough from sticking) and let it rest covered in plastic wrap for an hour or until it is doubled in size.
Once the dough has risen, punch down the dough and turn it onto a lightly floured surface.
Shape the dinner roll dough into 12 equal-sized dough balls (each should be roughly 88-89g).
Place in a buttered 9x13 pan and let rest for another hour or until soft and puffy.
Once the rolls are risen, heat your oven to 375°F and bake for 30 minutes or until golden brown.
Just before the rolls come out of the oven, mix the melted butter, garlic, salt, and parsley. Brush the garlic butter mixture over the rolls as soon as they come out of the oven for maximum flavor absorption.
3 tablespoons melted unsalted butter, 1 tablespoon minced garlic, 1 tablespoon chopped fresh parsley, ¼ teaspoon salt