Biscuits and Gravy with Homemade Chicken Breakfast Sausage

Name: Biscuits and Gravy with Homemade Chicken Breakfast Sausage
Ingredients: 4 freshly baked buttermilk biscuits (such as Eating Well‘s Buttermilk Biscuits); extra virgin olive oil; homemade chicken breakfast sausage* (recipe follows), uncooked; 1/4 cup all-purpose flour; 3/4 tsp Kosher salt; 3/4 tsp freshly ground black pepper, plus more for garnish; 1/4 tsp ground sage; 1 1/2 cup 1% milk; 1/2 lb ground chicken; 1/2 tsp ground sage; generous 1/4 tsp Kosher salt; generous 1/4 tsp freshly ground black pepper; 1/8 tsp cayenne pepper; 1/8 tsp brown sugar