Monte Cristo Breakfast Casserole

The smell of ham and turkey warming through layers of buttery brioche still takes me back to snowy Sunday mornings when my roommate would emerge from her room with sleepy eyes and ask what was baking. I had never thought to turn a diner sandwich into a breakfast casserole until that winter, but the way the Swiss cheese melted into pockets of raspberry preserves made complete sense the moment I took that first bite. Now it is the only thing I want when the calendar turns to December.

I once brought this to a potluck where I arrived late and flustered, certain the casserole had dried out in the oven. When I cut into it, steam rose up carrying that unmistakable scent of melted Swiss and warm preserves. People went quiet for a full minute before someone asked for the recipe, and three friends have since told me it is now their Christmas morning tradition too.

Ingredients

• Brioche or challah bread: These eggy breads absorb the custard beautifully and stay tender without turning mushy, plus they add a subtle sweetness that balances the meats
• Whole milk: The fat content keeps the texture rich and creamy, so do not be tempted to swap this out for skim milk
• Large eggs: Room temperature eggs will whisk more smoothly into the milk and help the custard set evenly
• Shredded Swiss cheese: Swiss melts with that perfect gooey pull and has a mild nutty flavor that does not fight the other ingredients
• Cream cheese: Cut this into small cubes while cold so it creates little pockets of creamy tang throughout the casserole
• Cooked ham and turkey: Leftover holiday ham and turkey work wonderfully here, just dice them into bite sized pieces for even distribution
• Raspberry preserves: The seeds add texture and the tart fruit cuts through the rich dairy and salty meats
• Dijon mustard: Just a tablespoon in the custard adds a sharp background note that keeps the dish from tasting too sweet
• Powdered sugar: This final dusting makes the dish look elegant and evokes the classic Monte Cristo presentation

Instructions

Preheat your oven:

Set the temperature to 350°F and generously butter a 9x13 baking dish, getting into the corners

Whisk the custard:

Combine eggs, milk, Dijon mustard, salt, and pepper in a large bowl until the mixture is completely smooth

Build the first layer:

Arrange half the bread cubes in the dish, then scatter with half the ham, turkey, Swiss cheese, and cream cheese cubes

Add the preserves:

Drop small spoonfuls of half the raspberry preserves over the layer so every bite will have a hint of fruit

Repeat the layers:

Add the remaining bread, meats, cheese, and cream cheese, then finish with the rest of the preserves

Pour and press:

Pour the egg mixture evenly over everything and press down gently with your hands to help the bread absorb the liquid

Let it rest:

Cover tightly with foil and refrigerate for at least an hour, though overnight is even better for the deepest flavor

Bake covered:

Keep the foil on for the first 30 minutes so everything steams and cooks through evenly

Golden finish:

Remove the foil and bake another 15 minutes until the top is golden brown and the center is set

Dust and serve:

Let the casserole rest for 10 minutes, then sift powdered sugar over the top and pass extra preserves at the table

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My sister made this for her in laws last year and called me afterward laughing because her father in law had eaten three servings before admitting he usually hates breakfast casseroles. Something about the way the flavors remind people of a restaurant sandwich they loved as kids, but elevated and comforted into something you can eat with a spoon in pajamas.

Make It Ahead

This casserole was practically designed for overnight prep. Assemble everything the night before, cover tightly with foil, and let it chill in the refrigerator. In the morning, just pop it in the cold oven and add 5 to 10 minutes to the baking time since it will be starting from a colder temperature.

Cheese Swaps

Swiss is traditional but Gruyère adds a deeper nutty flavor that pairs beautifully with the ham and turkey. If you want something milder, a good quality provolone melts beautifully and will not overpower the other ingredients.

Serving Suggestions

A simple arugula salad dressed with lemon vinaigrette cuts through the richness and makes this feel like a proper brunch. For a more casual spread, serve alongside fresh fruit and maybe some crispy bacon if you want to double down on the savory elements.

• Warm the extra raspberry preserves slightly so they drizzle more easily over each serving
• A dusting of powdered sugar right before serving keeps it from dissolving into the surface
• This reheats surprisingly well, so do not stress about leftovers

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There is something so satisfying about turning a sandwich into a casserole, like you have figured out a clever kitchen trick that no else knows. This dish has become my go to for whenever I want to feed people something that feels special but actually does most of the work while I sleep.

Recipe FAQs

→ Can I prepare this casserole ahead of time?

Yes, this actually benefits from refrigerating overnight. The bread absorbs more of the custard, resulting in a creamier texture and more developed flavors. Simply assemble, cover, and refrigerate for up to 12 hours before baking.

→ What type of bread works best?

Brioche or challah are ideal choices because their rich, tender texture absorbs the custard beautifully without becoming mushy. French bread or a sturdy white sandwich bread can also work in a pinch.

→ Can I use different meats or cheeses?

Absolutely. While ham and turkey are traditional, you can use leftover roasted chicken, crumbled bacon, or sliced deli chicken. Gruyère, provolone, or aged cheddar make excellent substitutes for Swiss cheese.

→ Is the raspberry preserves necessary?

It's what gives this dish its signature Monte Cristo flavor, but you can adjust or substitute. Strawberry or apricot jam work well, or reduce the amount if you prefer a more savory profile. The preserves balance the salty meats and rich cheese.

→ How do I know when it's done baking?

The casserole is ready when the top is golden brown and the center is set—no liquid custard should be visible when you gently press the center with a spoon. A thermometer inserted into the center should read 160°F.

→ Can I freeze leftovers?

Yes, individual portions freeze well for up to 2 months. Wrap tightly and reheat in the microwave or oven at 350°F until warmed through. The texture may be slightly softer than freshly baked.