Instructions:
- Preheat oven to 375°F (190°C). Lightly grease a 9x13 inch (or 3-quart) baking dish.
- Brown the Italian sausage in a large skillet over medium-high heat, breaking it up. Drain off excess fat.
- Add the diced onion to the skillet and cook until softened (about 5 minutes). Add minced garlic and Italian seasoning; cook for 1 minute until fragrant.
- Spread the cooked sausage mixture evenly across the bottom of the prepared baking dish.
- Pour the low-carb marinara sauce evenly over the sausage layer. Sprinkle half (¾ cup) of the shredded Mozzarella over the sauce.
- In a medium bowl, whisk together the softened cream cheese, eggs, almond milk/cream, garlic powder, and baking powder until completely smooth.
- Gently and evenly pour the cream cheese/egg mixture over the cheese and sauce layer. Do not stir.
- Sprinkle the remaining ¾ cup Mozzarella and the ½ cup Parmesan evenly over the top layer.
- Bake for 35–40 minutes, or until the casserole is set in the middle, bubbly, and the top is golden brown. Cover loosely with foil if the top browns too quickly.
- Let the casserole rest for 10 minutes before slicing and garnishing with fresh herbs before serving.