In a skillet over medium heat, cook the breakfast sausage, breaking it into crumbles. Sauté until it’s fully cooked and browned, then drain any excess grease and set aside.

Grease a 9×13-inch baking dish with butter or non-stick spray. Evenly layer the bread cubes across the bottom, creating a solid base for your casserole.

Sprinkle the browned sausage over the bread layer, followed by a generous amount of shredded cheddar cheese. Spread it out evenly to ensure every bite is flavorful!

In a large bowl, whisk together the eggs, whole milk, salt, and black pepper until well combined. If you’re using veggies, stir them in now for a nutrition boost.

Pour the egg mixture evenly over the assembled casserole layers. Use a spatula to gently press down, helping the bread absorb the egg mixture thoroughly.

Cover the dish with foil and refrigerate it for at least 1 hour. For the best flavor and texture, consider letting it rest overnight—the flavors will meld beautifully!

When you're ready, preheat your oven to 350°F (175°C). This ensures your casserole cooks evenly for that perfect golden finish.

Bake the casserole uncovered for 40–45 minutes. It should be golden brown on top and set in the center, creating a delectable, hearty meal.

Once baked, let it cool slightly before slicing. This brief wait allows the casserole to set up a bit, making it easier to serve.