Creating this Easy Turkey Sausage and Leek Egg Casserole is a breeze if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
2. Cook Sausage: In a large skillet, heat olive oil over medium heat. Add the turkey sausage and cook until browned, breaking it apart with a spatula.
3. Add Leeks: Once the sausage is cooked, add the sliced leeks to the skillet. Sauté for about 5 minutes until the leeks are tender.
4. Whisk Eggs and Milk: In a large bowl, whisk together the eggs, milk, salt, and black pepper until well combined.
5. Combine Ingredients: Add the cooked sausage and leeks to the egg mixture. Stir in the shredded cheese until everything is evenly distributed.
6. Transfer to Baking Dish: Pour the mixture into the prepared baking dish and spread it out evenly.
7. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the eggs are set and the top is golden.
8. Cool and Serve: Once baked, remove the casserole from the oven and let it cool for a few minutes. Garnish with fresh herbs if desired.