Step 1

Preheat oven to 375, with rack on lower middle position.

Step 2

In a large skillet, heave olive oil on medium-high heat until hot. Add onion and garlic, stirring until aromatic and translucent, 2-3 minutes. Add ground sausage, stirring to crumble it up well and brown it.

Step 3

In skillet with cooked sausage, add flour and gently stir until fully incorporated. Add milk and stir. Add 1/2 tsp kosher salt and 1/2 tsp black pepper. Bring mixture to low boil, stirring, until sauce is thickened to desired gravy consistency. (It should be creamy, yet thin enough to evenly pour into casserole. Taste gravy and add more kosher salt or black pepper as needed. Turn heat off and cover to keep warm.)

Step 4

Cut the biscuits into even quarters. Grease bottom of 8x8 baking dish and layer half of the biscuit quarters evenly into bottom - it's fine for there to be space between each biscuit. Bake 10 minutes uncovered, or until puffy and golden brown.

Step 5

Evenly spoon the gravy over baked biscuits. Place remaining biscuit quarters evenly on top of gravy. Cover loosely with foil and bake 14 minutes. Remove foil and continue baking 10 more minutes or until tops are puffy and golden brown. Serve immediately.