In a bowl mix together 1 cup warm milk (250ml), 1 whole egg, 1 egg yolk, 3 tbsps sugar (45g), and 2 tsp instant yeast (6g). Add 3 and 1/2 cup bread flour (430g) and 1 tsp salt (5g). Mix until the dough forms. Add 1/4 cup unsalted butter (55g), mix until fully absorbed.
Watch out
Add the butter only after the dough has come together, otherwise the flour cannot hydrate properly and the dough will become a sticky mess.






