Pour egg mixture evenly over the sausage in the baking dish. Cover and refrigerate overnight.
Bake in an oven preheated to 350°F for 1 hour. Let sit for 15-20 minutes before serving. Garnish with parsley, if desired.
Notes
Expert Tips✘ Use a sausage you love. If you want a milder flavor use a mild sausage. If you like a little more heat, use your favorite spicy breakfast sausage.✘ Grate your own cheese! Pre-shredded cheese is coated so it won't clump but that also means it doesn't melt as smoothly. Freshly shredded cheese from a block melts more evenly.✘ Half and Half + Milk: Use a combination of whole milk and half & half to get a fluffy egg dish with a lot of flavor.✘ Prep it ahead of time. Make sure you refrigerate the egg bake for at least 10 hours as the croutons need time to absorb the liquid.✘ Don't forget the garnish. Parsley adds a nice pop of color when you serve the egg bake. Pico de Gallo is another great option for a garnish.✘ Let it rest for 15-20 minutes before serving to so the dish can set up and slice cleanly.