Measure the milk into a jug or bowl and microwave for roughly 40-60 seconds. The milk needs to be 40°C/110°F to properly activate the yeast. No thermometer? No problem. Test the temperature by dipping your finger into the milk, it should feel like warm bathwater.
Pour the warm milk into a large bowl of an electric mixer. Haven't got an electric mixer? Just use a normal large mixing bowl.
Sprinkle the yeast on top of the milk and let it rest for 1 minute.
Add the melted butter, sugar, whole egg and egg yolk. Use a wooden spoon to mix the ingredients together.
Now add the white bread flour and salt. Use your wooden spoon to work the mixture into a rough dough.
Attach a dough hook and your mixing bowl to your electric mixer. Turn the speed up to medium and knead the dough for 8 minutes. No electric mixer? Just tip the dough onto a floured surface and knead by hand for 10 minutes instead. The dough should be smooth and springy to the touch.
Lift the dough out and lightly brush the inside of the bowl with oil. Place back inside and cover with clingfilm and a warm towel.
Place the bowl in a warm part of your home (I put mine next to a radiator) and leave to prove for roughly 45-60 minutes until the dough has doubled in size.