Creamy Leftover Gammon and Potato Bake with Dijon Mustard and Cheese

Name: Creamy Leftover Gammon and Potato Bake with Dijon Mustard and Cheese
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Yield: 6
Cuisine: British
Ingredients: 2 cups cooked gammon, diced; 3 medium potatoes, thinly sliced; 1 small onion, thinly sliced; 2 tablespoons butter; 2 tablespoons all-purpose flour; 1 1/2 cups whole milk; 1 tablespoon Dijon mustard; 1/2 teaspoon garlic powder; Salt and black pepper, to taste; 1 1/2 cups shredded cheddar cheese; 1/4 cup grated Parmesan cheese; 1 tablespoon fresh parsley, chopped (for garnish)

Rated 5.0 stars by 1 users

Cuisine

British

Servings

Prep Time

20 minutes

Cook Time

50 minutes

Calories

435

Leftover gammon is one of the most versatile ingredients to have on hand after a big family meal or holiday feast. And what better way to transform those savoury, smoky slices into a comforting new dish than with a warm and creamy potato bake?

This Leftover Gammon and Potato Bake is not only hearty and flavourful, but it’s also the perfect way to turn kitchen odds and ends into a meal your whole household will love.

This recipe is essentially comfort in a casserole dish. Thinly sliced potatoes and leftover gammon are layered with a velvety Dijon-spiked cheese sauce, baked until bubbly and golden on top. It's rich, creamy, and deeply satisfying — exactly what you want on a chilly evening. It’s a fantastic solution for minimising food waste while maximising flavour, making it an ideal weeknight option that still feels indulgent.

Serve it on its own or with a crisp side salad or green beans to balance out the richness. This bake proves that leftovers can be just as exciting as the original meal — if not more so.

Image of Creamy Leftover Gammon and Potato Bake with Dijon Mustard and Cheese

Ingredients

2 cups cooked gammon, diced
3 medium potatoes, thinly sliced
1 small onion, thinly sliced
2 tablespoons butter
2 tablespoons all-purpose flour
1 1/2 cups whole milk
1 tablespoon Dijon mustard
1/2 teaspoon garlic powder
Salt and black pepper, to taste
1 1/2 cups shredded cheddar cheese
1/4 cup grated Parmesan cheese
1 tablespoon fresh parsley, chopped (for garnish)

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Directions

Preheat oven to 375°F (190°C). Grease a medium baking dish with butter or non-stick spray.
In a saucepan, melt butter over medium heat. Stir in flour and cook for 1 minute to form a roux.
Gradually whisk in milk until smooth. Add Dijon mustard, garlic powder, salt, and pepper. Simmer for 5–6 minutes until thickened.
Stir in 1 cup of the shredded cheddar cheese until melted and smooth.
Layer half the sliced potatoes in the bottom of the baking dish. Top with half the onions and half the diced gammon.
Pour over half the cheese sauce. Repeat with remaining potatoes, onions, gammon, and cheese sauce.
Sprinkle the top with the remaining 1/2 cup of cheddar and all the Parmesan.
Cover with foil and bake for 30 minutes. Remove foil and bake for another 15–20 minutes until golden and bubbling.
Let rest for 10 minutes before serving. Garnish with chopped parsley.

Nutrition

Serving Size: 1
per serving: Calories; 435

Amount/Serving % Daily Value

Fat: 25 grams; 32%
Saturated Fat: 13 grams; 65%
Cholesterol: 75 milligrams; 25%
Sodium: 720 milligrams; 31%
Carbs: 28 grams; 10%
Protein: 22 grams
Sugar: 3 grams
Fiber: 2 grams; 7%

Tips for Cooking Leftover Gammon Bake

Use waxy potatoes like Yukon Gold for best texture.
Slice potatoes thin and evenly for consistent cooking.
Add a pinch of nutmeg or thyme to the sauce for depth.
Don’t skip the Dijon — it lifts the whole flavour profile.
Make the sauce slowly to avoid lumps — whisk continuously.
Use leftover boiled or roasted potatoes if you have them — just reduce the bake time.
Let the bake rest before serving to allow it to set and slice neatly.
Add a handful of frozen peas or spinach between layers for extra veg.
Sprinkle breadcrumbs on top before the final bake for a crunchy finish.
Store leftovers covered in the fridge for up to 3 days and reheat gently.

Serve It With Suggestions

A simple green salad with lemon vinaigrette
Steamed green beans or roasted broccoli
Crusty bread or garlic rolls
Pickled onions or gherkins for contrast
A crisp apple cider or dry white wine
Buttered peas or carrots
Classic coleslaw for crunch
Tomato chutney or mustard on the side
Mashed parsnips or celeriac
A light soup starter like leek and potato

FAQ's

Q: Can I make this dish ahead of time?
A: Yes! Assemble the dish, cover, and refrigerate. Bake when ready to serve.

Q: Can I freeze leftover gammon bake?
A: Yes, once baked and cooled. Wrap tightly and freeze for up to 2 months.

Q: What’s the best potato to use?
A: Waxy varieties like Yukon Gold or Charlotte hold their shape and layer well.

Q: Can I use other cheese?
A: Absolutely — try gruyère, mozzarella, or a cheese blend for variation.

Q: What’s a good substitute for Dijon mustard?
A: Whole grain mustard or a touch of English mustard will work too.

Q: Can I add vegetables to this bake?
A: Yes, peas, spinach, leeks, or even mushrooms make great additions.

Q: How do I store leftovers?
A: Store covered in the fridge for up to 3 days. Reheat in oven or microwave.

Q: Can I make this gluten-free?
A: Yes, use gluten-free flour in the roux and ensure cheese is gluten-free.

Q: Is this recipe kid-friendly?
A: Very! The cheesy sauce and soft texture make it a comforting dish for all ages.

Q: Do I need to peel the potatoes?
A: Not necessarily — leaving the skin on adds texture and nutrients.

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Creamy Leftover Gammon and Potato Bake with Dijon Mustard and Cheese