How to Make It
Preheat oven to 350°F. Place sausage in a cast-iron skillet over medium. Cook, stirring often, until sausage crumbles and is no longer pink, about 6 minutes. Transfer to a plate lined with paper towels to drain. Wipe skillet clean. Reduce heat to low, and add butter to skillet. Cook until melted. Whisk in flour until smooth. Cook, whisking constantly, 1 minute. Gradually whisk in milk. Increase heat to medium, and cook, whisking constantly, until thickened and bubbly, 10 to 12 minutes. Stir in cooked sausage, salt, and pepper. Arrange 8 biscuits in a circle on top of sausage mixture, leaving about 1/2 inch around edge of skillet. Place 1 biscuit in the middle.
Bake in preheated oven until biscuits are browned and gravy is bubbly, 20 to 25 minutes. Let stand 10 minutes.