Whisk the water and yeast together in the bowl of a stand mixer fitted with the dough hook. Let stand for 2 to 3 minutes, until foamy. Whisk in the milk, followed by the sugar, salt, egg, egg yolks, butter, vanilla, and cinnamon. Stir to combine, then stir in the all-purpose flour and 2 cups of the bread flour. Knead, with the mixer set to its lowest speed, for 8 to 10 minutes, gradually adding additional bread flour as needed to form a soft but firm dough.