Add all the ingredients for the brioche dough (the bread flour, all-purpose flour, instant yeast, salt, whole milk, egg, granulated sugar, butter and vanilla paste) to the bowl of a stand mixer affixed with a dough hook. Knead on medium speed for 5-7 minutes until the dough is smooth and mostly sticks to the hook.If kneading by hand, knead until dough is smooth. It will be a little sticky - this is normal.
Allow the dough to rest, covered with a clean towel, for 10 minutes.
Make the cinnamon filling while the dough rests. Mix the softened butter, brown sugar and ground cinnamon with a spoon until it forms a paste. Set aside.
115 grams unsalted butter, 115 grams dark brown sugar, 1 TABLEspoon ground cinnamon
Turn the dough out onto a dry, lightly floured surface and roll out in a rectangular shape to ¼-inch thickness.I roll my dough out until it measures around 13 inches long and 18 inches wide.
Using an offset spatula or the back of a spoon, spread the cinnamon filling in an even layer across the rolled out dough then cut the dough into 8 strips, cutting parallel to the shorter edge.
Roll up each strip, making sure not to stretch the dough in the process then arrange the rolls in a 9-inch baking dish lined with parchment paper.
Bake the cinnamon rolls for 30 minutes. The cinnamon rolls will not be golden brown. This is fine.
Cream Cheese Frosting
While cinnamon rolls bake, prepare frosting by beating the softened cream cheese with the granulated sugar on high speed until smooth.
Use room temperature ingredients unless otherwise stated.
If you're using a KitchenAid stand mixer, do not leave it unattended when kneading, as it tends to shift around.
Use a kitchen scale. It's more precise, and prevents you from using too much flour, which would make the cinnamon buns dense. If you insist on measuring by volume, make sure you spoon the flour into the measuring cups, then level. Pack the brown sugar.
You can substitute the bread flour for all-purpose flour. You'll end up with softer cinnamon rolls, but you'll lose a bit of the chewy texture.