Add warm milk, 1 tablespoon of brown sugar, and the yeast to a large bowl. Stir gently, then let it proof for 5–15 minutes, until the mixture becomes foamy and bubbly.
Add the remaining brown sugar, melted butter, cinnamon, and eggs to the bowl. Mix until everything is fully combined.
Add 2 cups of the flour and mix well. Then add the salt and stir until fully combined.
Add 1 more cup of flour and mix well—next, using about ¼ of the remaining flour, flour your work surface. Pour the dough onto the floured surface and begin kneading.
Gradually incorporate enough of the remaining flour into the dough, kneading until it’s no longer sticky. The dough should be soft and pliant, with a slight tackiness preferred over adding too much flour. Knead for 8–10 minutes.
Add the oil to the bowl and place the kneaded dough inside, turning it so both sides are coated with oil. Cover with cling wrap or a towel and let the dough rise in a warm spot until doubled in size, about 45 minutes to 1 hour.
Once the dough has doubled in size, punch it down and roll it out on a lightly floured surface into an approximately 16 × 23-inch rectangle.