Melt the bacon grease in a large skillet over medium heat.
Add the flour, one tablespoon at a time, whisking well after each addition to remove lumps.
Gradually add the milk, stirring constantly, until the mixture thickens to your desired consistency. Season with salt and pepper.
Remove the gravy from heat and keep warm.
In a second skillet, melt 1 tablespoon butter over medium-low heat.
While the butter melts, warm the sausage and biscuits. Split biscuits and top each half with a sausage patty.
Crack 4 eggs into the skillet. Cook 1–2 minutes until whites are set. Season with salt and pepper.
Cook eggs to your preference:Sunny-side up: do not flipOver easy: cook 10–20 seconds after flippingOver medium: cook 30–60 seconds after flippingOver hard: cook until yolk is fully set
Place one egg on each sausage-topped biscuit half.
Repeat with remaining butter and eggs.
Spoon warm gravy over the top and serve.
Notes
Serving Size: 2 biscuit halves topped with 2 sausage patties, 2 eggs, and ¼ cup + 2 tablespoons of gravy.
Keep heat moderate to avoid overcooking eggs.
Covering the pan helps set whites without flipping.
Butter adds flavor; oil can be substituted for crispier edges.