Preheat your oven to 350 degrees. Spray a pie dish with oil.

Cook the sausage in a large skillet over medium heat, breaking up until cooked, about 5 minutes.

Add the spinach and reduce heat to low, cook until wilted stirring occasionally, about 7 minutes. Drain spinach well.

Evenly spread the spinach sausage mixture in a prepared dish and top with grated havarti and parmesan cheese.

Make the custard mixture by whisking together the milk, half & half, eggs, salt, black pepper, and nutmeg.

Pour the custard into the dish and bake for 35 to 40 minutes until the center is set.

Cut into 6 pieces and serve.