In the bowl of a stand mixer fitted with the paddle attachment, stir together yeast, sugar and warm water and allow to sit for 5 minutes. After 5 minutes, it should be bubbly. If not, throw it out and start again. Add the warm milk, oil egg, and salt. Add 3 cups of flour slowly and beat until incorporated. Switch to your dough hook and begin adding more flour 1/2 cup at a time until the dough pulls away from the sides of the bowl. Continue kneading for about 6 minutes on medium-high. It will still be quite sticky but that's how you want it. Add the cinnamon chips and beat until just incorporated. Don't overbeat it as the dough will be warm and you don't want the cinnamon chips to melt completely.