Step 1: Preheat the Oven

Preheat your oven to 425°F (218°C). Line a baking sheet with parchment paper.

Step 2: Prepare the Biscuit Dough

1. In a large mixing bowl, whisk together flour, baking powder, baking soda, and salt.
2. Add the cold butter cubes and cut them into the flour using a pastry cutter or fork until the mixture resembles coarse crumbs.
3. Pour in the buttermilk and mix gently until the dough comes together. Avoid overmixing.

Step 3: Roll and Cut Biscuits

1. Turn the dough out onto a lightly floured surface and gently knead it a few times.
2. Roll out the dough to about 3/4-inch thickness.
3. Use a biscuit cutter or a round glass to cut out biscuits and place them on the prepared baking sheet.
4. Bake for 12-15 minutes, or until golden brown.

Step 4: Make the Sausage Gravy

1. In a large skillet over medium heat, cook the sausage, breaking it into crumbles until browned and fully cooked.
2. Remove excess grease, leaving about 1 tablespoon in the pan.
3. Add butter to the skillet and stir until melted.
4. Sprinkle the flour over the sausage and stir continuously for 1-2 minutes to cook the raw flour taste out.
5. Gradually pour in the milk, whisking constantly to prevent lumps.
6. Continue stirring until the gravy thickens (about 5-7 minutes).
7. Season with salt, black pepper, garlic powder, and red pepper flakes if using.

Step 5: Serve

1. Split a warm biscuit in half.
2. Pour a generous amount of sausage gravy over the biscuit.
3. Serve immediately and enjoy!