Prepare the Biscuits

1. Preheat Oven: Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, baking powder, baking soda, and salt.
3. Cut in Butter: Add cold butter cubes and use a pastry cutter or your fingertips to blend until the mixture resembles coarse crumbs.
4. Add Buttermilk: Pour in the buttermilk and stir gently until the dough comes together. Avoid overmixing.
5. Shape the Biscuits: Turn the dough out onto a floured surface, pat it into a 1-inch-thick rectangle, and fold it over itself a few times to create layers. Cut biscuits using a round cutter.
6. Bake: Place biscuits on the prepared baking sheet and bake for 12-15 minutes or until golden brown.

Prepare the Sausage Gravy

1. Cook Sausage: Heat a skillet over medium heat and cook the sausage until browned and fully cooked, breaking it into small pieces. Do not drain the grease.
2. Add Flour: Sprinkle flour over the sausage and stir, cooking for 1-2 minutes to remove the raw flour taste.
3. Pour in Milk: Gradually whisk in the milk, stirring constantly to prevent lumps.
4. Season: Add salt, black pepper, and cayenne pepper (if using). Simmer until the gravy thickens, about 5-7 minutes.

Assemble the Dish

1. Split Biscuits: Split the warm biscuits in half and place them on a plate.
2. Spoon Gravy: Generously ladle the sausage gravy over the biscuits.
3. Garnish: Sprinkle with fresh parsley or a dash of black pepper for added flavor and visual appeal.