1. Preheat your oven to 425°F.

2. Mix together the all-purpose flour, baking powder, baking soda, and salt in a large bowl.

3. Incorporate the cold, cubed unsalted butter into the dry ingredients until the mixture resembles coarse crumbs.

4. Gently stir in the buttermilk until the dough just comes together.

5. Turn the dough out onto a lightly floured surface and knead gently.

6. Pat the dough into a 1-inch thick circle and cut out biscuits.

7. Arrange the biscuits on a baking sheet and bake for 12-15 minutes until golden brown.

8. While the biscuits bake, cook the breakfast sausage in a skillet over medium heat until browned and crumbly. Drain excess fat, leaving about 2 tablespoon.

9. Sprinkle 1/4 cup of all-purpose flour over the remaining fat in the skillet and whisk for 1-2 minutes.

10. Slowly pour in the milk, whisking constantly to prevent lumps. Let simmer until thickened.

11. Stir in the cooked sausage, black pepper, and cayenne pepper if using.

12. Split the baked biscuits in half and spoon sausage gravy over them. Sprinkle crumbled bacon on top.