Preheat oven to 450 degrees- Add about 2 tbsp of butter to your cast iron skillet and place it in the oven to heat.
I usually start the biscuits first so that I can get them baked while I prepare the sausage gravy.
Place all dry biscuit ingredients into a mixing bowl and mix together thoroughly. Cut in cold butter (or cold coconut oil if substituting) until well incorporated. Stir in milk, adding enough that the dough holds together, but is not wet.
At this point you can either use this dough to make drop biscuits on a cookie sheet, or choose to roll it out and cut rounds. For me, it just depends on how much time I have to fuss, and though the rounds are fussy, they are sooooo much better when prepared using the roll-out method.
If rolling out, flour your rolling area and roll dough to about 1/2" -3/4" thick depending on your preference. I usually do about 1/2", and use a 2-3" round cup or biscuit cutter to cut them out.
Remove your pre-heated pan from the oven and spread the butter around to coat the whole bottom of it. Place biscuits in the pan and flip to coat with butter on both sides. Leave about 1/2" of space between the biscuits.
Bake in batches for about 12 minutes, until they are golden brown, adding 2 tbsp of butter to the pan for each batch. Make sure to flip the biscuits before baking each batch so that they are buttered on both sides!
Set biscuits aside, keep warm.