In the bowl of a stand mixer fitted with a bread hook attachment, stir together the milk, yeast and 1 tbsp of the sugar. Cover and let it sit for 5 or so minutes, then add 1 cup of the bread flour, the egg, the butter (sliced into 4 pieces), the additional 1 tbsp of sugar and the salt. Beat on low speed for 30 seconds or so, until combined, then scrape down the sides of the bowl and add the additional 2 cups of bread flour.