Our Test Kitchen has made dozens and dozens of breakfast casseroles over the years, but this one is our latest favorite. Made with day-old mini croissants, caramelized onions, and a rich and cheesy egg custard flavored with a touch of Dijon, this Croissant Breakfast Casserole is a real crowd-pleaser and can be made-ahead. Assemble the casserole and store it, unbaked, in the refrigerator overnight. Then, in the morning, all you have to do is pop it in the oven. Keep an eye on the casserole as it bakes. The buttery croissants exposed on top get dark quickly, so be sure to tent it with foil while it finishes cooking.
*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
**Nutrient information is not available for all ingredients. Amount is based on available nutrient data.
(-)Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.