In a large mixing bowl, combine the 1 cup sourdough discard, 2 cups all-purpose flour ¼ cup milk, 2 tablespoons unsalted butter 1 tablespoon sugar, 1 teaspoon salt, and 1 teaspoon instant yeast (if using). Stir until a sticky, cohesive dough forms.
Turn the dough onto a lightly floured surface and knead for 5–7 minutes until smooth and elastic. Sprinkle a little flour if the dough is too sticky.
Divide the dough into 6 equal portions. Shape each portion into a smooth ball and place in a greased baking dish or parchment-lined pan, leaving space between rolls.
Cover the rolls with a clean kitchen towel or plastic wrap and let them rise in a warm spot for 45–60 minutes, or until puffed and nearly doubled.
Preheat oven to 375°F (190°C). Optional: brush tops with melted butter. Bake 15–20 minutes until golden brown and cooked through.
Remove from oven and let cool slightly. Serve warm with butter, jam, or alongside your favorite meal.