We ate a lot of breakfast casseroles growing up. Any time there was a crowd to be fed before noon, this baked dish of egg, sausage, cheese, and day-old bread would appear. And yet, as adults, we've discovered that the classic breakfast casserole is a relative mystery to many of our friends.
The appeal is this: You throw everything in the dish the night before, allow the bread to soak up the egg-and-milk mixture overnight, and bake it in the morning. Breakfast casserole is perfect for a brunch party, since you don't have to stand at the stove making individual omelettes or batches of pancakes. And it beats waiting outside in the cold at a crowded restaurant.
This recipe is an updated version of the gooey, sausage-and-cheddar casseroles of our youth, and it was inspired by a fancy ham and cheese sandwich. We used pancetta and Gruyère (although you could try an even more sophisticated cheese, with challah bread and caramelized onions for a touch of sweetness. Then we added nutmeg and thyme to brighten things up.
The best part: we got to sleep in (and even crawled back to bed while it was in the oven).

serves 6 to 8
4 cups (loosely packed) day-old challah bread, cut into 3/4-inch cubes
2 tablespoons olive oil
1 medium onion, thinly sliced
1/2 teaspoon salt
1/4 teaspoon sugar
1/2 pound pancetta (thickly sliced), diced
6 eggs
1 1/2 cups whole milk
1/2 teaspoon dry mustard
1/4 teaspoon freshly grated nutmeg
2 teaspoons fresh thyme leaves
1 cup grated gruyere cheese (about 4 ounces)
Grease an 8-inch square baking dish and throw in the cubed challah.
Heat 1 tablespoon of the olive oil in a skillet over medium to low heat. Add the onions, salt, and sugar. Sauté until they are lightly caramelized (a medium golden brown color), about 15 minutes.
In another heavy saucepan, heat the other tablespoon of olive oil over medium heat and sauté the pancetta until the fat is almost all rendered and it begins to get crisp, about 8 to 10 minutes. Set on a paper towel to drain.
Whisk together the eggs, milk, dry mustard, nutmeg, and thyme. Season with salt and pepper.
Sprinkle pancetta over the bread cubes, then layer onions on top. Sprinkle grated Gruyère on next, and then pour the egg mixture over the entire thing.
Press down on the top gently, so that all of the bread cubes get soaked a bit with the egg mixture. Cover and refrigerate overnight.
In the morning, preheat the oven to 350 degrees F (take the casserole out of the fridge while the oven is preheating). Bake, uncovered, for 30-35 minutes, or until the edges are bubbling and the top begins to brown.
Serve with a green salad, some asparagus, or just a tall Bloody Mary.
(Originally published February 20, 2008)
This is by Elizabeth, who is up for one of our new writer positions. Welcome Elizabeth!

Comments (23)
looks delicious. i always end up making breakfast for my 6 family members on sunday. I will definatley try this within the week.
Faith that sounds delicious!! I love breakfast casseroles and how convienant I will have the family in this weekend, will have to give this new version a try :)
It's called cheese strata I think. It's a Penn. Dutch thing, isn't it???
My Mom always called it "strata", but there was no Pennsylvania Dutch connection for us. She always made it for Christmas, never any other time. Very strange. I made one recently from Pamela Anderson's "Perfect Recipes For Having People Over" and it was utterly fantastic.
We always called it egg strata, too, and always make it at Christmas. Likewise, we've got no PaDutch connections, either.
We make both a savory (sausage) and a sweet (raisins and nuts).
this looks SO good -- i can't wait to make it over the snowy weekend
I couldn't resist- I made it and it was delicious! Everyone raved about the recipe. thanks for posting-
We've been trying to cut back on our weekend brunch outings, so I gave this recipe a try today... and it was every bit as divine as it looks in the photos. Thanks for posting!
Okay, this sounds fantastic. I love the idea of using challah--the better to soak up all that egg and cheese! I'm printing this recipe right now. Yum! Thanks!!
yes, please. that's all.
How well would this freeze pre-cooking? Would I be able to thaw it out overnight then pop it in the oven in the am?
this was delicious! i made it this weekend - photo here:
http://photos-d.ak.fbcdn.net/photos-ak-sf2p/v651/163/111/718350487/n718350487_1581155_8127833.jpg
i used red onion instead of a white onion and it ended up a lavender color in the process of baking!
I love making strata and here's what I have learned by trial and error: don't cube the bread. It tends to make for uneven baking, and the finished dish comes out looking like a lumpy mattress.
For best results, use sliced day old bread and fit the pieces snugly into the casserole dish, then add custard and other fillings. White bread or Challah are the best at soaking up the custard. Stay away from crunchy or chewy breads; they are not absorbent enough.
First saw these in Alberta, where they're known as "wife savers". Not politically correct, but delicious just the same.
Thanks. I'm new to the wonders of challah. Our daughter now brings home a loaf each Friday from preschool and we need something to do with it other than just toast and French toast. I'm making this this weekend!
I use glass Pyrex baking dishes. I would be concerned about putting a cold pan from the fridge into a hot oven. The warnings always say not to submit the pans to temperature extremes. Has anyone done this in Pyrex and how long did you let the pan sit out before putting it in the oven?
Re: Pyrex. I made something similar yesterday for a work potluck breakfast. Instead of preheating the oven first, I put the dish right into the oven, so that the glass dish would warm up with the oven and not have such a drastic change of temperature. It worked fine, I added 3 minutes to the baking time to account for warming up, and had no issues. (the baking time on my recipe is 50 minutes).
Ham and challah... what sacrilege!
(wonder how it would be with lox...)
Another good one this week. Thank you!
Looks fantastic. I'm going to give this a try this weekend then enjoy the leftovers the rest of the week.
Haha was wondering about the ham and challah! ;o)
We don't eat meat, but thinking about doing this with asparagus or spinach instead. Or one of the veggie Italian sausages or Gimme Lean.
OK, I've done this twice now. It needs to be cooked way longer than it says, and/or with less liquid and/or more challah, or else it kind it ends up being like a bread pudding texture, and ew. Other than that, it's pretty amazing.
Oh, regarding the extreme temperatures; thermal transfer with a glass or similar container in the air with fairly solid contents is pretty slow, so you should be fine. It's only likely to break if, say, you slam a hot glass container into a bucket of ice water, since a water bath will pretty much instantly cool something.