In a medium skillet over medium heat, cook the ground breakfast sausage until browned and cooked through, about 8 to 10 minutes.
Add the frozen shredded hash browns to the air fryer basket. Air fry at 350°F for 8 to 10 minutes, stirring halfway, until golden and crisp.
Stir the flour, salt, and black pepper into the cooked sausage and let it coat everything for about 1 minute.
Pour in the milk and cook, stirring, until the gravy thickens, about 2 to 5 minutes.
Transfer the crispy hash browns to a small air-fryer-safe baking pan or cast iron plate. Pour the sausage gravy over the top and air fry at 370°F for another 2 to 3 minutes.
Plate, serve hot, and enjoy.