Heat a skillet over medium heat. Once hot add in the sausage to cook and break it into small pieces. Cook, stirring occasionally, until the sausage is browned, about 7-8 minutes. Remove from heat.
While the sausage is cooking, chop onion, garlic, bell pepper, mushrooms, spinach and sage as noted. Shred cheese if you are using cheese.
Grease a large baking dish with ghee.
In a mixing bowl, whisk eggs. Add the sausage, chopped veggies, cheese (if you are using cheese) salt and pepper and mix. Pour everything into the baking dish.
Bake for 30 minutes, or until eggs are set in the middle.
Allow to cool for 5-10 minutes, cut into pieces, and serve.
Nutrition facts are per serving and an estimate provided for those following a Ketogenic or low-carb diet. They do not include optional toppings for this recipe. See our full nutrition information disclosure here.