There’s something magical about the first morning of a brand-new year. The house is quiet except for the soft clink of coffee cups, the windows still hold the last of winter’s early darkness, and everyone—kids, cousins, college friends crashing on the sofa—moves a little slower, savoring the hush before life speeds back up. In our family the tradition is simple but non-negotiable: we gather around the dining table still in our pajamas and share one ridiculously comforting, cheesy, ham-laden breakfast casserole. No reservations, no dress code, no fussy plating—just a golden, bubbling dish that smells like forgiveness for last night’s champagne and promise for the year ahead.

I started making this particular ham-and-cheese strata ten years ago when our guest list unexpectedly doubled and I had exactly one loaf of sourdough, a half-pound of holiday ham, and a serious need for caffeine. One bite in and my father-in-law declared it “the luckiest thing we ever ate,” so the name stuck. We’ve served it every January first since, sometimes with mimosas, sometimes with strong black coffee, always with the belief that beginning the year around a shared table sets the tone for everything that follows. If you’re looking for a make-ahead, feed-a-crowd brunch centerpiece that tastes like a hug, you just found it.

Why This Recipe Works

Overnight magic: Assemble everything the night before; the bread soaks up the custard so you just bake and serve.
Triple-cheese blend: Smoked gouda, sharp white cheddar, and nutty Gruyère create layers of flavor that complement the ham.
Texture contrast: Cubed sourdough gives chewy pockets while a mustard-kissed custard keeps the interior silky.
Feeds a dozen: One 13×9-inch pan yields twelve generous slices—perfect for buffet-style brunch.
Flexible add-ins: Swap veggies, use gluten-free bread, or go meatless without losing deliciousness.
Minimal cleanup: Everything mixes in one bowl; the casserole bakes in a single dish.
Freezer-friendly: Bake, cool, slice, and freeze portions for up to two months.

Ingredients You'll Need

Stale sourdough bread: A sturdy, tangy loaf holds up to the custard without turning to mush. Buy it two days early or cube and toast at 300 °F for 15 minutes. No sourdough? A crusty Italian or French loaf works, but avoid super-soft sandwich bread.

Cooked ham: Leftover holiday ham is ideal; otherwise ask the deli counter for a ½-inch thick slice you can dice. Look for low-sodium varieties so the casserole doesn’t end up tasting like a salt lick.

Eggs: Twelve large eggs create the custard base. Room-temperature eggs blend more smoothly, so pull them out first.

Whole milk & heavy cream: The 50-50 ratio delivers richness without feeling greasy. Swap the cream with half-and-half if you must, but don’t go all skim—it bakes up rubbery.

Mustard trio: A teaspoon each of Dijon, stone-ground, and dry mustard adds depth. The tiny amount won’t scream “mustard!” but it will whisper complexity.

Cheeses: Smoked gouda brings wood-fired notes, sharp white cheddar offers classic comfort, and Gruyère supplies that irresistible nutty pull. Buy blocks and shred yourself; pre-shredded cellulose can make the custard grainy.

Seasonings: Kosher salt, freshly cracked black pepper, a pinch of nutmeg, and chopped chives brighten the heavy ingredients.

Optional veggies: Sautéed mushrooms, wilted spinach, or roasted red peppers fold in beautifully for color and nutrients.

How to Make New Year's Day Ham and Cheese Breakfast Casserole for Brunch

Prep the pan & bread

Butter a 13×9-inch baking dish. Cut or tear stale sourdough into 1-inch cubes (about 12 packed cups). Spread half the bread in the dish; reserve the rest.

Build the first layer

Scatter 1½ cups diced ham and 1 cup shredded smoked gouda over the bread. Top with the remaining bread cubes, pressing lightly to fit.

Whisk the custard

In a large bowl whisk 12 eggs, 2 cups whole milk, 2 cups heavy cream, 3 Tbsp melted butter, 1 Tbsp Dijon, 1 tsp stone-ground mustard, 1 tsp kosher salt, ½ tsp pepper, and ¼ tsp nutmeg until completely homogenous.

Soak & top

Pour custard evenly over the layered bread. Press with a spatula to submerge every cube. Sprinkle the remaining 1 cup white cheddar and 1 cup Gruyère on top. Cover tightly with foil that’s been sprayed with nonstick spray (prevents sticking).

Chill overnight

Refrigerate at least 8 hours and up to 24. This rest allows the bread to fully absorb the custard, yielding a cohesive, almost soufflé-like texture.

Bake low, then high

The next morning, preheat oven to 325 °F. Bake covered for 30 minutes, then remove foil, increase temperature to 375 °F, and bake 25–30 minutes more until the top is blistered and a knife inserted in the center comes out clean.

Rest & garnish

Let stand 10 minutes—this sets the custard for clean slices. Sprinkle with fresh chives and cracked pepper before serving.

Serve & celebrate

Cut into squares and accompany with fruit salad, mimosas, or strong coffee. Leftovers reheat like a dream in the microwave for 60–90 seconds.

Expert Tips

Room-temp dairy

Take milk, cream, and eggs out 30 minutes before mixing; cold liquid can cause the melted butter to seize into tiny flakes.

Don’t skip the rest

The overnight soak is crucial for custard absorption. In a rush? Minimum 4 hours, but texture improves with the full 8.

Check temp, not time

Ovens vary; bake until center reaches 165 °F. If top browns too soon, tent loosely with foil.

Press gently

When adding custard, lightly press bread so it drinks up the liquid but don’t compact it—air pockets equal fluffiness.

Freeze smart

Cool completely, cut into squares, wrap each in plastic then foil, and freeze up to 2 months. Reheat covered at 300 °F for 25 minutes.

Color pop

Add roasted red-pepper strips or chopped parsley on top before serving for a festive confetti look worthy of New Year’s Instagram shots.

Variations to Try

Denver-style: Fold in sautéed onions, green bell pepper, and a handful of diced cooked potatoes.
Vegetarian: Replace ham with roasted butternut squash and kale; swap chicken stock for vegetable stock in the custard.
Tex-Mex: Sub pepper-jack for gouda, add diced green chiles and cilantro, serve with salsa and avocado.
Gluten-free: Use a sturdy gluten-free bread or cubed hash browns; check mustard labels for hidden wheat.
Luxury upgrade: Trade ham for lump crabmeat and add a few tablespoons of mascarpone to the custard.

Storage Tips

Refrigerate: Cool leftovers within 2 hours, cover tightly, and refrigerate up to 4 days.

Freeze: Wrap individual portions in a double layer of plastic wrap plus foil, or place in freezer-safe bags with air pressed out. Label and freeze up to 2 months.

Reheat: Thaw overnight in the fridge, then warm covered at 300 °F for 20–25 minutes or microwave single slices at 70% power for 90 seconds.

Make-ahead mini casseroles: Divide mixture among greased muffin tins, refrigerate overnight, bake 18–22 minutes for grab-and-go portions.