Pour milk into a small saucepan. Add one whole egg and egg yolk (leave the egg white for coating), and sugar, and with a whisk stir it all together over a medium heat until the mixture is lukewarm. Make sure you don’t overheat your mixture, otherwise it will kill the yeast.
Next, add the yeast and gently whisk it all together. Let the mixture stand for approximately 10 minutes until you notice the yeast is activated.