Preparation

Preheat oven to 350°F (175°C).

In a skillet, heat butter or tallow (1 Tbsp) over medium heat. Add chopped onion (1 small) and sauté until softened, about 3–4 minutes.

Add breakfast sausage (1 lb) to the skillet and cook until browned and cooked through, breaking it up as it cooks. Drain excess fat if desired.

In a large bowl, whisk together eggs (8), heavy cream (½ cup), salt (½ tsp), and pepper (½ tsp).

Add cooked sausage and onions to the egg mixture, then stir in shredded cheddar cheese (1 cup).

Pour the mixture into a greased casserole dish and bake uncovered for 30–35 minutes, or until the eggs are set and the top is golden.

Remove from oven and let cool slightly before slicing.

Drizzle extra virgin olive oil (1 Tbsp total, divided) over the casserole just before serving and garnish with chopped chives or parsley.