Drizzle olive oil into a skillet and when hot add onion and mushrooms. Cook until onions begin to soften, about 3 minutes. Add garlic and remove from the heat.
Heat cooked sausage and chicken stock together in a large skillet or dutch oven. Stir arrowroot powder and 1/4 cup water together in a cup or small bowl until combined.
Pour the arrowroot and water mixture into the sausage and stir until it begins to thicken
Add onions, mushrooms, garlic and about 2/3 of the parmesan cheese and stir to combine.
Add the cooked Fettuccine noodles and stir to combine.
Add salt and pepper to taste.
Add chopped parsley if using. Serve immediately and garnish with remaining parmesan cheese.
Notes
I used an Italian flavored turkey sausage. Don't use a breakfast sausage.
This recipe was calculated using the exact brands and measurements I used to make this recipe. If you are following a strict diet please note changing anything will cause the nutritional info to change. My calculations are intended as a guide only.