This Make-Ahead Pancetta and Gruyère Breakfast Casserole Is a Fancy Take on Classic Ham and Cheese

updated May 4, 2023
"Ham and Cheese" Breakfast Casserole
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Credit: Faith Durand

We’re heading into prime brunch season, which means that brunch casseroles are about to enjoy their heyday. So I decided to revisit one of our most popular recipes ever, published several years ago, for a breakfast bake with bread, pancetta, Gruyere, and eggs.

I’m afraid I’ll sound horribly hyperbolic if I talk about this recipe too long: It’s rich, eggy, and unbelievably, incredibly delicious. This is one to memorize, folks, and to pull out for in-laws and overnight guests. It may just be the very best brunch casserole I’ve ever made.

Credit: Faith Durand

I ate a lot of breakfast casseroles growing up. Anytime 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 an adult, I’ve discovered that the classic breakfast casserole is a relative mystery to many of our friends.

A Classic Combo Prepped in Advance

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 cheddar and sausage casseroles of my 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 about this make-ahead casserole? You get to sleep in (and even crawl back to bed while it bakes in the oven).

Credit: Faith Durand

Tester’s Notes

When I revisited this casserole, I did so with great anticipation. It’s always received rave reviews and I was hungry to try it. I wasn’t disappointed (and neither was my husband, who ate it the next morning with a glint of this-is-too-good-to-be-true delight in his eyes). This dish is outrageously good, with tender, eggy bread and savory cheese in every bite.

I’ve made a lot of breakfast casseroles, but this is the first one to be layered in such a distinct way. Usually I jumble the bread, meat, and cheese all up together. This one is baked in layers, like a strata, with the bread on the bottom, then the pancetta, cheese, and herbs. This makes for a beautiful presentation and a very tasty dish; I liked how the layers looked as they were spooned out.

A couple notes: While the make-ahead aspect of this dish is very convenient, you don’t have to make it ahead. You can also throw it together and bake it immediately.

Also, I did find that it needed a little more time to bake, especially since I used a deeper oven-safe bowl to bake it in. So that is reflected in changes to the instructions below.

Faith, October 2012

"Ham and Cheese" Breakfast Casserole

Serves 6 to 8

Nutritional Info


  • 4 cups

    (loosely packed) day-old challah or other egg-enriched bread (3/4-inch cubes)

  • 2 tablespoons

    olive oil, divided

  • 1

    medium yellow onion, thinly sliced

  • 3/4 teaspoon

    kosher salt, divided

  • 1/4 teaspoon

    granulated sugar

  • 8 ounces

    thickly sliced pancetta, diced

  • 6

    large eggs

  • 1 1/2 cups

    whole milk

  • 1/2 teaspoon

    dry mustard

  • 1/4 teaspoon

    freshly grated nutmeg

  • 2 teaspoons

    fresh thyme leaves

  • 1/4 teaspoon

    freshly ground black pepper

  • 1 cup

    grated Gruyère cheese (about 4 ounces)


  1. Grease an 8-inch square baking dish (or another 1 1/2-quart to 2-quart baking dish) and spread the cubed bread in the bottom.

  2. Heat 1 tablespoon of the oil in a medium skillet over medium heat until shimmering. Add the onions, 1/4 teaspoon of the salt, and sugar. Cook, stirring occasionally, until lightly caramelized (a medium golden-brown color), about 15 minutes.

  3. Meanwhile, in another heavy skillet, heat the remaining 1 tablespoon 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. Transfer to a paper towel-lined plate to drain.

  4. Whisk the eggs, milk, dry mustard, nutmeg, thyme, remaining 1/2 teaspoon salt, and pepper together in a large bowl.

  5. Spread the pancetta over the bread cubes, then layer the onions on top. Sprinkle grated Gruyère on next, and then pour the egg mixture over the entire thing.

  6. 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.

  7. Arrange a rack in the middle of the oven and heat to 350°F. Take the casserole out of the refrigerator so it can warm on the counter while the oven preheats.

  8. Bake, uncovered, until the edges are bubbling and the top begins to brown, 35 to 50 minutes. The baking time will be greatly dependent on the depth of dish you use. Check the interior with a knife; if it comes out clean the bread custard is baked through. (Cover with aluminum foil near the end of cooking if the top is already browned.)

Recipe Notes

Make ahead: The casserole can be assembled, covered tightly with aluminum foil, and refrigerated overnight before baking. Uncover and bring to room temperature before baking.

Storage: Leftovers can be stored in an airtight container in the refrigerator for up to 4 days.

This was originally posted February 2008.