Brown the sausage in a heavy-bottomed pot (cast iron works well). Break into crumbles and cook until edges are crispy and deeply golden. Remove sausage, reserving the fat in the pan.
Add the butter to the fat and melt. Whisk in the flour slowly to make a roux, stirring until golden and toasty, about 2 minutes.
Whisk in the brewed coffee—it will sizzle. Then, gradually stream in the milk, whisking constantly until smooth and velvety.
Bring to a gentle simmer, stirring often, until thickened, about 10 minutes.
Stir in the sausage, salt, pepper, garlic powder, onion powder, and paprika.
Just before serving, grate in a touch of orange zest for brightness. Garnish with parsley and serve hot over biscuits, mashed potatoes, or your carb of choice.