When it comes to starting your day right, a delicious breakfast is the key. And for those savory breakfast enthusiasts out there, we've got an amazing make - ahead breakfast casserole that's going to become a staple in your morning routine. This casserole combines the best of ingredients, from savory sausage to earthy mushrooms, multiple cheeses, and fresh herbs, all baked alongside strips of Texas toast. It's an irresistible combination that will have your taste buds dancing with joy.

Let's start with the star of the show - the sausage. Sausage adds a rich, meaty flavor to the casserole. You can choose your favorite type of sausage, whether it's spicy Italian sausage for a bit of a kick or mild breakfast sausage for a more traditional taste. Brown the sausage in a pan until it's cooked through and crumbled. The aroma of the cooking sausage will fill your kitchen and get you excited for the meal to come.

Next up are the mushrooms. Mushrooms bring an earthy and umami flavor to the dish. You can use a variety of mushrooms, such as white button mushrooms, cremini mushrooms, or even shiitake mushrooms for a more exotic touch. Slice the mushrooms and sauté them in the same pan where you cooked the sausage. The mushrooms will absorb the flavors from the sausage and add a depth of flavor to the casserole.

Now, let's talk about the cheeses. Multiple cheeses are used in this casserole to create a creamy and indulgent texture. You can use a combination of cheddar cheese, mozzarella cheese, and even a bit of parmesan cheese for a nutty flavor. The cheddar adds a sharpness, the mozzarella melts beautifully, and the parmesan gives a nice crust on top when baked. Grate the cheeses and set them aside for later.

Fresh herbs are another essential component of this casserole. Herbs like thyme, rosemary, and parsley add a burst of freshness and aroma. Chop the herbs finely and sprinkle them over the sausage and mushroom mixture. The herbs will not only enhance the flavor but also make the casserole look more appealing.

And then there are the strips of Texas toast. Texas toast is thick - cut and has a great texture. It soaks up the flavors of the other ingredients and becomes a delicious base for the casserole. Arrange the strips of Texas toast in the bottom of a baking dish. You can overlap them slightly to create a solid base.

Once you have all your ingredients prepared, it's time to assemble the casserole. Layer the sausage and mushroom mixture over the Texas toast. Then, sprinkle the grated cheeses evenly over the top. Pour in some beaten eggs and milk to bind the ingredients together. The eggs and milk will create a custard - like texture when baked.

Cover the baking dish with foil and refrigerate it overnight. This make - ahead step is perfect for busy mornings. When you're ready to eat, simply preheat your oven and bake the casserole until it's golden brown and bubbly on top. The smell of the baking casserole will fill your home and make you eager to dig in.

When the casserole is done, let it rest for a few minutes before serving. You can cut it into squares and serve it with a side of fresh fruit or a cup of coffee. This breakfast casserole is not only delicious but also a great way to feed a crowd. Whether it's a family breakfast on the weekend or a brunch with friends, this casserole is sure to be a hit.

In conclusion, this make - ahead breakfast casserole is a must - try for all savory breakfast lovers. With its combination of sausage, mushrooms, multiple cheeses, fresh herbs, and Texas toast, it's a dish that's full of flavor and easy to prepare. So, add this casserole to your breakfast list and start your day with a delicious and satisfying meal.