Step 1: Prepare the Drop Biscuits

1. Preheat the oven to 450°F (230°C). Line a baking sheet with parchment paper or lightly grease it.
2. In a large bowl, combine flour, baking powder, sugar, and salt. Stir to mix evenly.
3. Add cold butter pieces and cut them into the flour mixture until it resembles coarse crumbs with pea-sized butter pieces.
4. Pour in the milk and gently stir until the dough is just combined (it should be slightly lumpy).
5. Drop spoonfuls of dough onto the baking sheet, spacing them 1-2 inches apart.
6. Bake for 10-12 minutes until golden brown. Remove from the oven and set aside.

Step 2: Make the Sausage Gravy

1. In a large skillet, heat over medium heat. Add sausage and cook until browned, breaking it up with a spoon.
2. Sprinkle flour over the cooked sausage and stir for 1-2 minutes to cook the flour.
3. Gradually add milk, stirring constantly, until the gravy thickens. If too thick, add more milk to achieve desired consistency.
4. Season with salt, pepper, and optional red pepper flakes. Simmer for 3-4 minutes and adjust seasonings.

Step 3: Assemble the Dish

1. Split the biscuits and place them on serving plates.
2. Spoon the sausage gravy generously over the biscuits.
3. Serve hot and enjoy!