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There’s something quietly magical about the first meal of the year. For as long as I can remember, my grandmother insisted that whatever landed on our plates before noon on January 1st would set the tone for the next 364 days. She wasn’t superstitious—she was strategic. A ham bone left from Christmas dinner would be tucked into the freezer, a bag of Yukon Golds waited in the pantry, and a brick of sharp cheddar was hidden behind the cranberry juice so no one would nibble it away before the big day. By 10 a.m. on New Year’s morning, the house smelled like butter, onions, and salty ham; the scent curled upstairs and coaxed even the most reluctant revelers out of bed.
This casserole is my streamlined, 21st-century homage to that memory. It layers thin, creamy potatoes with smoky ham, a whisper of Dijon, and a lid of nutty Gruyère that bubbles into a bronzed blanket under the broiler. It feeds a crowd without demanding last-minute fussing, and it tastes like the edible equivalent of a down comforter—comforting, familiar, and just indulgent enough to make everyone feel celebrated. Whether you’re hosting a brunch for twelve or you simply want to treat yourself to a plate of something that whispers, “the year is going to be delicious,” this bake belongs on your January 1st table.
Why This Recipe Works
- One-pan elegance: Everything bakes in a single 13Ă—9 dish, meaning fewer dishes and more time for board games and mimosas.
- Pre-sliced potatoes: A mandoline or food processor shaves hours off prep and guarantees even cooking.
- Silky quick roux: Whisking the flour into hot butter for exactly 90 seconds removes any raw taste and thickens the cream in record time.
- Double cheese insurance: Nutty Gruyère on top for a show-stopping crust, melty sharp cheddar between layers for depth.
- Flexible ham ratio: Use 1½–3 cups depending on leftovers; the sauce is designed to stay creamy either way.
- Make-ahead magic: Assemble up to 24 hours in advance, then bake straight from the fridge—just add 15 extra minutes.
- Good-luck symbolism: Ham for prosperity, potatoes for grounding, and cheese (because happiness is its own kind of luck).
Ingredients You'll Need
Great scalloped potatoes hinge on three pillars: starch choice, dairy fat ratio, and seasoning intensity. Below is the grocery list plus the “why” behind every component—and the swaps that won’t tank your results.
Produce
- Yukon Gold potatoes, 3 lb – Naturally buttery and waxy; they hold their shape yet soften into velvet. Russets will cloud the sauce, so stick with golds.
- Yellow onion, 1 medium – Adds gentle sweetness. Shallots work in a pinch.
- Garlic, 2 cloves – Just enough to perfume the roux without shouting.
Protein
- Diced cooked ham, 2 cups (about 10 oz) – Use the good stuff from the deli if you don’t have holiday leftovers. Trim any tough edges; fat equals flavor, but gristle equals disappointment.
Dairy & Fats
- Unsalted butter, 4 Tbsp – Lets you control salt; European-style (82 %) gives the silkiest roux.
- Heavy cream, 2 cups – 36 % fat keeps the sauce stable for prolonged baking. You may sub 1 cup with half-and-half for a lighter bake, but don’t go leaner.
- Whole milk, 1 cup – Balances richness so the casserole doesn’t eat like dessert.
- Gruyère, 6 oz grated – Nutty, complex, and browns like a dream. Swiss is the closest sub, though milder.
- Sharp cheddar, 4 oz grated – Hidden middle layer; pre-shredded is fine but anti-caking agents can dull flavor, so grate if you can.
Pantry & Seasonings
- All-purpose flour, 3 Tbsp – Thickens the sauce; for gluten-free, use 1 ½ Tbsp cornstarch whisked with cold milk.
- Dijon mustard, 1 tsp – Invisible backbone; accentuates ham and cheese without screaming “mustard!”
- Fresh thyme leaves, 1 tsp – Earthy counterpoint to salty ham. Dried works—use ½ tsp.
- Freshly grated nutmeg, ⅛ tsp – The whisper that makes people ask, “What’s that cozy flavor?”
- Kosher salt & black pepper – Start conservative; ham and cheese bring salt to the party.
How to Make New Year's Day Ham & Scalloped Potatoes Casserole
Prep your mise en place
Heat oven to 375 °F (190 °C). Butter a 13×9-inch ceramic or enchilada-style baking dish; ceramic retains gentle heat and prevents the bottom layer from scorching. Peel the potatoes and slice ⅛-inch thick on a mandoline (food-safety guard on, please). Submerge slices in cold salted water for 10 minutes to remove excess starch—this prevents gummy layers and buys you time if the phone rings. Drain and pat thoroughly dry with kitchen towels; excess water dilutes cream.
Build the quick stovetop sauce
Melt butter in a heavy 3-quart saucepan over medium heat. Add onion and sauté 3 minutes until translucent; drop heat to medium-low, add garlic, and cook 30 seconds. Sprinkle flour over the buttery onions and whisk continuously for 90 seconds—set your timer. You want a blonde roux that smells like shortbread, not browning nuts. Gradually pour in cream and milk in three additions, whisking out lumps before the next splash. Once steaming, stir in Dijon, thyme, nutmeg, ½ tsp kosher salt, and ¼ tsp pepper. Simmer gently 2 minutes; sauce should coat the back of a spoon.
Layer #1: potatoes and ham
Arrange one-third of potato slices in overlapping rows to mostly cover the dish. Scatter half the ham plus a loose ¼ cup cheddar across the potatoes. Repeat these two layers once more. Finish with the final third of potatoes, pressing down gently to compact—this prevents soupy separation later.
Flood and cheese
Pour the warm sauce evenly over the casserole, shimmying the dish to encourage seepage. Sprinkle Gruyère across the top. Tear a sheet of foil large enough to tent without touching cheese; butter the underside to prevent sticking. Cover tightly.
Bake low and slow, then broil
Bake on the center rack 50 minutes. Remove foil and bake 20 minutes more, until potatoes are fork-tender and sauce is bubbling up around edges. Switch oven to broil on high 2–3 minutes, watching like a hawk, until the cheese freckles to a burnt-amber constellation. Rest 15 minutes; sauce thickens as it cools.
Garnish and serve
Scatter fresh thyme leaves or micro-chives for color. Serve in heaping spoonfuls alongside a tart spinach-citrus salad; the acid slices through richness and keeps everyone awake for parade watching.
Expert Tips
Mandoline safety hack
Cut a ¼-inch slice from one side of the potato so it sits flat on the guard; you’ll get perfect slices without the fingertip donation.
Sauce too thick?
Warm an extra ½ cup milk and drizzle over resting casserole; potatoes are thirsty and will drink it up.
Cheese swap maths
Gruyère pricey? Use 4 oz Swiss + 2 oz Parmesan for umami punch.
Crispy edge lovers
Bake in a cast-iron skillet; the sides caramelize into potato-jerky nirvana.
Over-salted?
Float a few raw potato disks on top during the covered bake; they’ll absorb some salt, then discard.
Transporting to brunch?
Under-bake by 10 minutes, cover with foil and a kitchen towel; it finishes en route and arrives bubbling.
Variations to Try
- Spicy-Sweet: Whisk 2 Tbsp mango chutney into the sauce and add ÂĽ tsp smoked paprika. Top with pepper-jack.
- Leek & Mushroom: Swap onion for sliced leeks and add 1 cup sautéed creminis between potato layers.
- Breakfast-All-In: Fold in 4 peeled, sliced hard-boiled eggs with the ham for protein pockets.
- Light-N-Lemony: Sub ½ cup cream with evaporated skim milk and add 1 tsp finely grated lemon zest to the sauce.
- Herb Garden: Replace thyme with 1 Tbsp mixed fresh dill and parsley; finish with chive blossoms.
Storage Tips
Refrigerator
Cool completely, portion into airtight glass boxes, and refrigerate up to 4 days. Reheat single servings in the microwave at 70 % power for 2 minutes, adding a splash of milk to loosen. For larger portions, cover with foil and warm at 325 °F for 20–25 minutes.
Freezer
Assemble through Step 4, wrap dish tightly in plastic then foil, and freeze up to 2 months. Thaw 24 hours in the refrigerator, then bake as directed, adding 15–20 extra minutes. If freezing leftovers, freeze individual scoops on a parchment-lined tray; once solid, transfer to zip bags for up to 1 month. Reheat from frozen (covered) at 300 °F for 40 minutes.
Make-ahead for entertaining
Complete Steps 1–4 the night before. Press plastic wrap directly onto the potatoes to prevent oxidation, then cover with foil. Next day, remove plastic, add Gruyère, and bake.
Frequently Asked Questions
New Year's Day Ham & Scalloped Potatoes Casserole
Ingredients
Instructions
- Preheat & prep: Heat oven to 375 °F. Butter a 13×9-inch baking dish. Peel potatoes and slice ⅛-inch thick; soak in cold salted water 10 minutes, drain, and pat dry.
- Make the sauce: In a saucepan, melt butter over medium heat. Sauté onion 3 minutes; add garlic 30 seconds. Whisk in flour 90 seconds. Gradually whisk in cream and milk; add Dijon, thyme, nutmeg, ½ tsp salt, and pepper. Simmer 2 minutes until thickened.
- Layer: Arrange one-third of potatoes in dish. Scatter half the ham and ÂĽ cup cheddar. Repeat layers once more. Top with final third of potatoes, pressing gently.
- Sauce & cheese: Pour warm sauce over casserole. Sprinkle Gruyère and remaining cheddar. Cover with buttered foil.
- Bake: 50 minutes covered, then 20 minutes uncovered, until potatoes are tender. Broil 2–3 minutes to brown top.
- Rest & serve: Let stand 15 minutes to thicken. Garnish with thyme and serve hot.
Recipe Notes
For best texture, slice potatoes uniformly. Casserole can be assembled up to 24 hours ahead; add 15 minutes to bake time if chilled.
