In a large bowl combine 1 tablespoon granulated sugar, warm milk and yeast. Mix and let it rise for 5-10 minutes.
1 cup whole milk, ¼ cup granulated sugar, 2 teaspoon instant yeast
Add in the sourdough discard, the rest of the sugar, and the egg. Mix well.
1 cup sourdough discard, 1 large egg, 1 teaspoon salt
Add the flour, softened butter, and salt to the bowl. Mix until a dough forms.
3 & ¾ cups all-purpose flour, ¼ cup unsalted butter
Knead the dough on a lightly floured surface for about 8-10 minutes or until smooth and elastic. Alternatively, you can use a stand mixer with a dough hook attachment to do this for you. You want to knead the dough until it starts pulling from the sides of the bowl. About 5-7 minutes.
Place the dough in a greased bowl, cover it with a damp cloth or plastic wrap, and let it rise in a warm place for 1 hours, or until doubled in size.