In a mixing bowl, combine yeast with slightly warm water around 100 - 110°F/43°C and 1 tablespoon of sugar. Add the yeast, mix and allow to sit for about 5-10 minutes until it becomes frothy. This indicates that the yeast is active and ready to be used. See note 1
When the yeast is frothy, add the remaining sugar, milk, salt, and bread flour. Mix the dough until it forms a dough ball.
Transfer the dough to a lightly floured surface and knead for about 8-10 minutes until it becomes smooth and elastic. Alternatively, if using a stand mixer, mix with the dough hook attachment and for approximately 5-7 minutes.
Add the oil and softened butter to the dough and continue kneading until it is fully incorporated. If kneading by hands, see note 2 for speed times.