1. 1. Preheat the oven to 375°F (190°C).

2. 2. Peel and dice the sweet potatoes, then boil them until they are tender. Drain and set aside.

3. 3. In a skillet, cook the pork sausages until browned. Remove from the skillet and set aside.

4. 4. In the same skillet, sauté the chopped yellow onion and garlic until translucent. Add in the sun-dried tomatoes and cook for another minute.

5. 5. In a mixing bowl, whisk together the eggs and almond milk. Season with salt and pepper.

6. 6. Grease a baking dish with butter. Layer the cooked sweet potatoes, sausage, onion mixture, cheddar cheese, and fresh basil in the baking dish.

7. 7. Pour the egg mixture over the layers in the baking dish.

8. 8. Top with grated Parmesan cheese.

9. 9. Bake in the preheated oven for 30-35 minutes, or until the casserole is set and golden brown on top.

10. 10. Serve hot with marinara sauce on the side.

11. 11. Enjoy your delicious Sweet Potato and Sausage Breakfast Casserole!