Heat a large pan over medium heat. Remove breakfast sausage from wrapping and sauté until crumbles are browned and cooked through.
Without draining any of the fat, add in 1/4 cup flour and stir with a wooden spoon to coat. The oil should absorb some of the flour and stick and clump to the sausage.
Add in the milk by half cups, stirring over medium heat and allowing to thicken. Once all milk has been added, reduce heat and simmer 1-2 minutes until thick.
Season with salt, pepper, and (optional) hot sauce to taste. I prefer a peppery gravy so I start with 1 tsp pepper & salt, but usually add a second tsp pepper.
Remove from the heat and allow the gravy to cool for at least 10-15 minutes, or up to overnight. The more it's allowed to cool and firm up the easier to stuff the biscuit bombs.