Pour milk into the bowl of a stand mixer, sprinkle yeast, and add egg yolk, egg, butter, and sugar; mix at medium speed until everything combines well.

Then add salt and flour and mix using a wooden spoon until the mixture looks like dough. Then start the electric mixer at medium speed and knead the dough for eight minutes or until it comes in the center of the bowl like a ball.

When the dough is ready, transfer it to an oiled bowl, wrap it with cling film and a clean kitchen towel, and leave for 1 hour or until the volumes double.

Once the dough becomes double in size, place it on a flour-dusted work surface and roll using a rolling pin until 14" x 9" rectangle; spread softened butter while leaving a ¼" border on all sides.

Add cinnamon and brown sugar in a small bowl, mix well, and sprinkle the mixture on top of the dough, then rub gently with your hands.

When the filling is done, roll the dough tightly, starting from the smaller side, and seal the dough properly. Then cut the roll into 1" sections using a sharp knife.

Place the cinnamon roll sections in a baking pan, cover them with a kitchen towel and leave for 30 to 40 minutes.

Prepare the air Fryer with cooking spray and preheat to 360 degrees F. Once cinnamon roll sections are ready, place them in the air fryer while maintaining a tiny space and cook for 8 minutes or until cooked through.

Then remove from the air fryer and serve.