This easy bacon and egg breakfast casserole recipe can be prepared the night before. Just take it out of the refrigerator and pop it in the oven in the morning. It's an excellent holiday morning meal or for sunday breakfast or brunch. Cooking and crumbling the bacon is a step that can be done days in advance, just keep it refrigerated. You can customize this recipe in many ways. You can include a variety of vegetables such as diced green and red peppers or canned green chiles. The casserole may be spiced up with pepper jack cheese, and the bacon may be replaced with about 8 ounces of browned sausage, diced ham, or chorizo. If needed, the unbaked casserole can be held in the refrigerator for two to three days, but past that point is not recommended for food safety. Be sure that your refrigerator maintains a constant temperature as raw eggs are a source of bacteria that can cause food poisoning. As well, you can bake the casserole immediately after assembling it rather than holding it overnight in the refrigerator.