Preheat the oven to 375F. Spray a 10 x 7" casserole dish with non-stick spray or similar.

Cook the ground sausage in a large skillet over medium-high heat, breaking it into small crumbles, for 8-10 minutes until it is browned all over. Drain any excess liquid and set aside to cool slightly.

Beat the eggs in a large bowl, then add one cup of the shredded cheese, plus the almond flour, heavy cream, and sour cream. Stir until fully combined.

Add the sausage and melted butter. Season with salt and a generous amount of black pepper and mix well.

Pour everything into the prepared casserole dish, and sprinkle the remaining cheese on top.

Bake for 15-20 minutes uncovered or until the center has cooked through and no longer wobbles when you gently shake the dish.

Let the bake rest for 5 minutes, then cut into six portions and serve.