Heat the milk in the microwave for 20 seconds. Test with your fingertip — it should feel warm but not hot.
Pour the warm milk into the bowl of your stand mixer. Add the instant dry yeast, granulated sugar, salt, soft salted butter (in pieces), and the egg.
Fit the mixer with the dough hook. Add half of the plain flour and mix on speed 1 until it starts to come together.
Slowly add the remaining flour while continuing to mix on speed 1 until the dough is well combined.
Continue kneading with the dough hook on speed 1 until the dough is smooth, elastic, and pulls cleanly away from the sides of the bowl (about 5–7 minutes).
Pour a drizzle of olive oil into a large mixing bowl and spread it around to coat the inside.
Transfer the dough to the oiled bowl and turn it once or twice so all sides are lightly coated in oil. Cover the bowl with a tea towel and set aside to rise for 75 minutes, or until roughly doubled in size.
Lightly oil a baking sheet with a little of the olive oil (or line with baking paper if you have it). Set it aside.
Punch down the risen dough to release the air. Divide the dough into 12 equal pieces.
Shape each piece into a smooth ball by cupping your hand in a "C" shape and rolling the dough on the work surface, creating surface tension. Place the 12 rolls on the prepared baking sheet, leaving a little space between them.
Cover the rolls with the tea towel and let them rise for another 60 minutes, or until puffy and nearly doubled.
Preheat the oven to 190°C.
Bake the rolls for 12–14 minutes, until just lightly browned on top.
Remove the rolls from the oven and allow them to cool slightly before serving.