In a large bowl, toss the potatoes with the olive oil, garlic powder, oregano, salt, and pepper until evenly coated. Arrange the potatoes in a single layer on the prepared baking sheet. Bake for 20 minutes, stirring once halfway through.
Meanwhile, in a medium skillet over medium heat, cook the sausage until browned, about 5 minutes. Drain off any excess fat.
Add the chicken broth and bring to a simmer. Sprinkle the flour over the sausage and stir to combine. Cook for 1 minute, stirring constantly.
Add the heavy cream and nutmeg and stir to combine. Simmer for 5 minutes, stirring occasionally, until thickened.
Remove the potatoes from the oven and sprinkle with the cheese. Return to the oven and bake for 5 minutes, until the cheese is melted and the potatoes are golden brown.
To serve, spoon the sausage gravy over the potatoes and sprinkle with parsley.
Interesting Facts
Fingerling potatoes are a variety of small, thin-skinned potatoes with a slightly nutty flavor.
Sausage gravy is a classic American comfort food that is often served over biscuits.
Sharp cheddar cheese adds a nice tangy flavor to the dish.