Leftover ham and cheese breakfast strata is the answer to the question every home cook asks the morning after a holiday meal: what do I do with all this ham? A strata is a layered casserole of bread, custard, cheese, and savory fillings, and it happens to be one of the most forgiving recipes in the breakfast repertoire. Cubes of stale bread soak up a rich egg-and-milk mixture overnight, the ham seasons every bite, and the cheese melts into gooey pockets. By morning, all you do is slide the dish into the oven and wait while the kitchen fills with the smell of a savory bake.

This version is built specifically around leftover baked ham and whatever cheese you have on hand. It uses precise quantities so the custard sets properly, includes make-ahead and same-day options, and offers practical swaps for bread, dairy, and add-ins. Whether you are feeding a crowd on a holiday morning or meal-prepping for the week, a strata turns scraps into something that tastes deliberate.

What Is a Breakfast Strata?

A strata is a savory bread pudding. Cubes of bread are layered with cheese and fillings, then covered with a custard of eggs and milk and baked until puffed and golden. The name comes from the Latin word for “layers,” which describes the construction perfectly. Unlike a frittata, which is mostly egg, a strata is mostly bread and custard, giving it a softer, more substantial texture.

Strata is traditionally assembled the night before, allowing the bread to fully absorb the custard. This is not just convenient; it is structural. Dry bread absorbs liquid slowly, and an overnight rest produces an even, creamy interior rather than a bake with soggy pockets and dry corners. That said, a same-day version is possible with a shorter soak, and instructions for both are included below.

Why This Recipe Works for Leftover Ham

Ham is an ideal strata filling because it is already cooked, salty, and flavorful. It does not need browning or precooking, so it can go straight into the layers. The salt in the ham seasons the custard from within, which is why this recipe uses only a modest amount of added salt. Cubed or shredded ham both work; a mix of thicker cubes and thinner shreds gives the strata a nice varied texture.

The cheese does double duty. Some goes between the bread layers for gooeyness, and some goes on top for a browned, crisp crust. A blend of a melting cheese and a sharper cheese gives the best flavor. The recipe below specifies quantities, but the section on substitutions covers how to adapt it to your refrigerator.

Ingredients

Serves 8 generously (or 10 to 12 as part of a larger brunch spread)

For the strata:

• 12 ounces (340 g) day-old crusty bread, such as sourdough, French bread, or Italian loaf, cut into 1-inch cubes (about 8 to 9 cups)
• 2 tablespoons (28 g) unsalted butter, softened, for greasing the dish
• 8 ounces (225 g) cooked leftover ham, cut into 1/2-inch cubes (about 1 3/4 cups)
• 1 1/2 cups (170 g) shredded Gruyère or Swiss cheese
• 1 cup (100 g) shredded sharp cheddar cheese
• 4 large eggs
• 2 large egg yolks
• 2 1/2 cups (600 ml) whole milk
• 1/2 cup (120 ml) heavy cream
• 1 tablespoon (15 g) Dijon mustard
• 1 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 1/4 teaspoon freshly grated nutmeg
• 2 tablespoons (6 g) finely chopped fresh chives or parsley, plus more for serving

Optional add-ins (choose up to two, keeping total additions to about 1 cup):

• 1/2 cup (75 g) diced roasted red peppers, patted dry
• 1/2 cup (50 g) sliced scallions
• 1 cup (30 g) packed baby spinach, roughly chopped
• 1/2 cup (60 g) caramelized onions
• 1/2 teaspoon red pepper flakes for heat

Equipment

• 9-by-13-inch (23-by-33 cm) baking dish, at least 2 1/2 inches deep
• Large mixing bowl
• Whisk
• Measuring cups and spoons
• Kitchen scale (optional but recommended for bread and cheese)
• Aluminum foil
• Instant-read thermometer (optional, for doneness)
• Sharp knife and cutting board

Preparation Instructions

Step 1: Prepare the bread

Cut the bread into 1-inch cubes, leaving the crusts on for texture and structure. If your bread is very fresh and soft, spread the cubes on a sheet pan and dry them in a 300°F (150°C) oven for 10 to 12 minutes, until they feel dry to the touch but have not browned. Dry bread is essential; fresh bread will collapse into mush.

Step 2: Grease the baking dish

Rub the softened butter generously over the bottom and sides of the 9-by-13-inch baking dish. This prevents sticking and adds a little richness at the edges.

Step 3: Layer the bread, ham, and cheese

Spread half the bread cubes in an even layer in the dish. Scatter half the ham over the bread, then sprinkle half the Gruyère and half the cheddar evenly on top. Repeat with the remaining bread, ham, and cheeses, reserving about 1/2 cup of cheese for the top. If using optional add-ins, scatter them between the two layers rather than on top, so they stay moist.

Step 4: Whisk the custard

In the large mixing bowl, whisk the 4 whole eggs and 2 yolks until smooth. Add the milk, cream, Dijon mustard, salt, pepper, and nutmeg. Whisk until fully combined, about 1 minute. Do not whip vigorously; you want a homogeneous mixture, not foam.

Step 5: Pour and press

Pour the custard slowly and evenly over the layered bread, making sure it reaches the corners. Press down gently on the bread with the back of a spoon or a spatula so every cube gets a chance to soak. The liquid should come about three-quarters of the way up the bread; if it looks low, press more firmly rather than adding liquid.

Step 6: Rest overnight (recommended) or for 30 minutes

Cover the dish tightly with plastic wrap or foil and refrigerate for at least 8 hours and up to 24 hours. If you are short on time, let it rest at room temperature for 30 minutes before baking, pressing the bread down once more halfway through. The overnight version produces the best texture.

Step 7: Bring to room temperature and preheat

Remove the strata from the refrigerator 30 minutes before baking to take the chill off. Preheat the oven to 350°F (175°C) with a rack in the center position.

Step 8: Top and bake

Uncover the dish and sprinkle the reserved 1/2 cup of cheese and the chopped chives over the top. Bake uncovered for 45 to 55 minutes, until the custard is set and the top is golden brown. The center should register 160°F (71°C) on an instant-read thermometer, and a knife inserted in the middle should come out clean or with only a slight moist crumb.

Step 9: Rest before serving

Let the strata rest for 10 to 15 minutes before cutting. This allows the custard to finish setting and makes clean slices possible. Serve warm, garnished with extra chives or parsley.

Cooking Times at a Glance

• Overnight soak: 8 to 24 hours refrigerated
• Room-temperature rest before baking: 30 minutes
• Bake time: 45 to 55 minutes at 350°F (175°C)
• Rest after baking: 10 to 15 minutes
• Total active time: about 25 minutes

Tips for the Best Strata

Use stale bread, not fresh. The single biggest factor in strata texture is bread dryness. A dry loaf absorbs custard without dissolving. If all you have is soft sandwich bread, toast the cubes first.

Do not skip the salt, but taste your ham. If your leftover ham is very salty (some glazed hams are), reduce the added salt to 1/2 teaspoon. If the ham is mild, keep the full teaspoon.

Keep add-ins dry. Vegetables like peppers and spinach release water when baked. Pat them dry and sauté any watery vegetables first, or the custard will turn soupy.

Press the bread down twice. Once when you pour the custard and once before baking. This ensures even soaking and prevents dry patches on top.

Bake uncovered for a crisp top. If the top browns too quickly, tent loosely with foil and continue baking. Do not cover for the whole bake, or the surface will stay pale and soft.

Let it rest. Cutting too soon gives you a runny center. Ten minutes makes a noticeable difference.

Practical Substitutions

Bread: Sourdough, French bread, Italian loaf, challah, brioche, or sturdy sandwich bread all work. Avoid very soft white bread unless toasted. For a gluten-free version, use a firm gluten-free loaf and reduce the milk by 2 tablespoons.

Ham: Swap in leftover cooked sausage, bacon, or smoked turkey. If using bacon, cook it crisp and drain well. Diced cooked chicken or roasted vegetables also work for a meat-free version.

Cheese: Gruyère can be replaced with Swiss, fontina, or Jarlsberg. Sharp cheddar can be replaced with Colby, Monterey Jack, or a smoked cheese. Keep the total at about 2 1/2 cups (250 g).

Dairy: Whole milk can be replaced with 2% milk, but avoid skim, which gives a thinner custard. Heavy cream can be replaced with half-and-half or whole milk; the result is slightly less rich but still good. For a dairy-free version, use unsweetened oat milk and a dairy-free shredded cheese, and expect a softer set.

Eggs: The two extra yolks enrich the custard but can be omitted; replace them with 1/4 cup additional milk.

Mustard: Dijon adds tang and depth. Whole-grain mustard or a teaspoon of prepared horseradish can stand in.

Make-Ahead and Storage Guidance

Make ahead: Assemble the strata through Step 5, cover, and refrigerate for up to 24 hours. Bake as directed, adding 5 to 10 minutes if it goes into the oven cold.

Refrigerating leftovers: Cool the baked strata completely, then cover tightly or transfer portions to airtight containers. Refrigerate for up to 4 days.

Freezing: Baked strata freezes well. Cut into portions, wrap each tightly, and freeze for up to 2 months. Thaw overnight in the refrigerator before reheating. An unbaked assembled strata can also be frozen for up to 1 month; thaw completely in the refrigerator before baking.

Reheating: Reheat individual portions in a 350°F (175°C) oven for 10 to 15 minutes, or in the microwave in 30-second intervals. The oven preserves the crisp top better than the microwave.

Food safety: Do not leave the strata at room temperature for more than 2 hours after baking. Keep it refrigerated until serving, and reheat to steaming hot.

Serving Suggestions

A strata is a complete brunch centerpiece, but it pairs well with a simple side salad dressed with lemon and olive oil, fresh fruit, or a dollop of Greek yogurt. For a heartier plate, add roasted potatoes or a side of sautéed greens. If you are planning a bigger spread, consider a sweet counterpoint from the recipe blog, such as a batch of cream filled donuts for dessert. Leftover ham also shines in other comfort dishes, like this meatloaf with Stove Top stuffing recipe, if you are looking for another way to use the rest of the roast.

Frequently Asked Questions