If you like fireball this is even better. I found this recipe published by Matt Allyn and have made it a few times. This is a nice fall whiskey for sipping round the fire pit while the leaves turn colors.
I have made the mistake of letting it infuse for too long and the cinnamon will over power the flavor. I suggest trying a sip after four days and check the flavor until you find it just right. Another treat we enjoy is a hot apple cider with some cinnamon whiskey.