In a large mixing bowl, whisk together the active yeast, cane sugar, room temperature egg, and whole milk until they are thoroughly combined.
Add the bread flour and sea salt to the mixture.
Work in the room temperature butter by hand or with a stand mixer, Once the butter is fully incorporated, knead the dough on medium speed using a dough hook attachment, or knead it by hand.
Transfer the dough to a greased bowl, and cover it with a damp cloth or kitchen towel. Let the dough rise at a temperature of around 72°F (22°C) for approximately one hour.