After biscuits have cooked, remove from skillet (if using) and allow to cool.
Add the skillet to the stovetop set over medium heat. Add the sausage to the skillet and brown completely, breaking into smaller pieces as it cooks.
Once cooked, remove the cooked sausage to a clean plate, leaving any drippings behind in the skillet.
In the same skillet, melt 3 tablespoons of butter. Sprinkle with 3 tablespoons of all-purpose flour and whisk for approximately one minute to cook out the flour. Slowly add in 1 cup of milk. Whisk continuously, creating your roux.
Add the sausage back to your gravy along with the black pepper and cinnamon. If you would like your gravy a bit thinner, add additional milk 1/4 cup at a time until you've reached the desired thickness.
Pour your warm gravy over buttery biscuits and garnish with fresh parsley or fresh thyme, if desired.