1cupparmesan cheese, grated(optional, omit for Whole30)
Chop onion and garlic as noted. Heat a large skillet over medium heat and add in Italian sausage. Break the sausage into small bits and then add in the onion and garlic. Cook, stirring occasionally, until the sausage is browned, about 7-8 minutes.
While the sausage is cooking, chop arugula and whisk eggs in a large bowl.
Grease a 9x13 baking dish with butter or ghee and preheat oven to 375° Fahrenheit.
When the sausage is finished, add it to the bowl with the eggs. Add in arugula, marinara sauce and oregano and mix everything together.
Pour egg mixture into the baking dish. Top with cheese (optional). Place in the oven to bake for 30 minutes, or until the eggs are firm throughout.
Nutrition facts are an estimate provided for those following a Ketogenic or low-carb diet and include the optional cheese for this recipe. See our full nutrition information disclosure here.