1-Start by gathering and prepping your ingredients to make the process smooth this overnight breakfast casserole begins with cubing the bread and lightly drying it. Once ready, whisk together 6 large eggs, 3 cups milk, ½ teaspoon dry mustard powder, ½ teaspoon salt, and ½ teaspoon black pepper in a large bowl for a creamy base. Grease a 9×13-inch baking dish to prevent sticking and set the stage for even cooking.

2-Next, build the layers by adding half the cubed bread to the dish, followed by half the cooked and crumbled bacon or diced ham, 3 green onions thinly sliced, ½ red bell pepper finely diced, and 4 cups shredded cheddar cheese. Repeat the layers to create a hearty stack that locks in flavors. Then, pour the egg mixture evenly over everything to moisten the bread fully, ensuring every bite is infused with goodness.

3-After assembling, cover the dish and refrigerate for at least 3 hours or overnight this step lets the flavors meld and the bread absorb the liquids. In the morning, bring the casserole to room temperature while you preheat the oven to 350°F. Bake it covered with foil for 45 to 55 minutes, or until a knife inserted comes out clean. If you’re baking two pans, extend the time to 60 to 80 minutes for thorough cooking.

4-For a crispy topping, broil the casserole for about 3 minutes until it’s golden, adding a nice crunch to the finish. Soaking the bread cubes in the egg mixture before layering can speed up baking, which is helpful for working professionals. This method not only simplifies mornings but also lets newlyweds or seniors enjoy a homemade treat without much fuss.