Bubble and Squeak Mash Jacket Potato

A bubble and squeak mash jacket potato is a crisp-skinned baked potato filled with buttery mash mixed with cabbage and browned until golden. Inspired by the British way of turning leftover potatoes and greens into a hearty pan-fried dish, this version makes a generous, comforting meal from familiar ingredients.

Ingredients

4 large baking potatoes, about 10 oz (280 g) each
1 tbsp (15 ml) olive oil
1 tsp (5 g) fine salt, divided, plus more to taste
1 lb (450 g) russet or other floury potatoes, peeled and cut into 1-inch (2.5 cm) chunks
2 tbsp (28 g) unsalted butter, plus 1 tbsp (14 g) for the topping
¼ cup (60 ml) whole milk, warmed
2 cups (150 g) finely shredded green cabbage
1 small yellow onion, about 5 oz (140 g), finely chopped
1 tbsp (15 ml) neutral oil, such as canola
¼ tsp (1 g) ground black pepper
½ cup (50 g) shredded sharp cheddar, optional

Instructions

Heat the oven to 425°F (220°C). Scrub the baking potatoes and dry them thoroughly. Prick each potato several times with a fork, rub with olive oil and sprinkle with about ½ teaspoon of the salt. Set them directly on the oven rack, with a baking sheet on a lower rack to catch drips. Bake for 55–70 minutes, until the skins are crisp and a knife slides into the centers easily. The time varies with potato size.
While the jackets bake, put the peeled potato chunks in a saucepan and cover with cold water by about 1 inch (2.5 cm). Add the remaining salt. Bring to a boil, then reduce to a steady simmer and cook for 12–15 minutes, until the pieces are tender when pierced. Drain well and return them to the hot pan for a minute so excess moisture evaporates.
Mash the boiled potatoes with 2 tablespoons (28 g) butter and the warm milk. Keep the mash fairly firm rather than loose; the cabbage and onion will add moisture. Set aside.
Warm the neutral oil in a large skillet over medium heat. Add the chopped onion and cook for 5–7 minutes, stirring occasionally, until soft and lightly golden. Stir in the cabbage and cook for another 5–8 minutes, tossing often, until wilted and tender with a few browned edges. If the pan looks dry or the cabbage catches, add a tablespoon of water and lower the heat.
Stir the cabbage and onion into the mash with the black pepper. Taste and add salt if needed. If using cheddar, mix in half of it now and save the rest for the topping.
When the baked potatoes are cool enough to handle, slice each one lengthwise. Gently press the ends toward the center to open the top, then scoop most of the fluffy flesh into the mash mixture. Leave a sturdy layer of potato attached to the skin so the shells hold their shape. Fold the scooped potato into the filling.
Spoon the bubble and squeak mash back into the four shells, piling it slightly above the edges. Dot with the remaining tablespoon (14 g) butter and scatter over the reserved cheddar, if using. Return the stuffed potatoes to the oven for 10–15 minutes, until hot throughout and browned in spots. Serve promptly.

Tips

Use floury potatoes for fluffy mash and crisp jackets. Waxy potatoes work in a pinch, but the filling will be denser and may need less milk.
Dry the drained mash potatoes well before adding milk. A wet filling can turn heavy and make the jacket shells soggy.
For a quicker route, use about 2 cups (450 g) of cold leftover mashed potato in place of the boiled potatoes, butter and milk. Adjust salt to taste; leftover mash may already be seasoned.
Handle hot potatoes with a clean kitchen towel or oven mitt, and avoid cutting through the base of the skins when scooping. This helps the shells stay intact when refilled.

Serving Suggestions

Serve one stuffed potato per person as a main course with a crisp green salad, steamed peas or roasted carrots. A spoonful of brown sauce, mustard or tangy pickle is a good match for the buttery potato and cabbage. For a larger meal, pair it with grilled sausages or roast chicken; cook meat separately and follow the appropriate safe internal temperature guidance.

Variations

Bubble and squeak varies by household and often uses whatever cooked vegetables are available. Replace some or all of the cabbage with 1½ cups (200 g) chopped cooked Brussels sprouts, kale or leftover carrots. Kale is sturdier, so cook it until tender before mixing it into the mash. For a sharper finish, add 1 teaspoon (5 ml) Dijon mustard or 2 tablespoons (20 g) sliced scallions.

To make the filling vegetarian with extra richness, add cheddar or a little grated Parmesan; check the label if you need a vegetarian cheese. For a dairy-free version, use plant-based butter and unsweetened oat or soy milk. You can also leave the cheese out entirely. A pinch of smoked paprika adds a gentle smoky note without changing the method.

Storage and Reheating

Refrigerate cooked potatoes within 2 hours. Store them in a covered container for 3–4 days; for best texture, keep the filling and empty jackets separate if you know you will have leftovers. The filling can also be frozen in a sealed freezer-safe container for up to 2 months, though thawed mash may be slightly softer. Thaw in the refrigerator before reheating.

Reheat stuffed potatoes in a 350°F (175°C) oven for about 20–30 minutes, or until the center reaches 165°F (74°C). Check with a food thermometer, especially if the filling is thick. A microwave works for a single portion: heat in short bursts, turning as needed, then check that the center reaches 165°F (74°C). Reheated leftovers should be steaming hot throughout, and should only be reheated once.

Frequently Asked Questions

Can I make these ahead?
Yes. Bake the jacket potatoes and prepare the filling up to a day ahead. Refrigerate both promptly in separate covered containers, then assemble and bake at 350°F (175°C) until hot throughout, allowing extra time if they go into the oven cold. The center should reach 165°F (74°C).

Why is my bubble and squeak filling soggy?
Excess water is usually the cause. Drain the boiled potatoes thoroughly, let them steam dry in the pan, and cook the cabbage until its moisture has evaporated before folding it into the mash. Add milk gradually rather than pouring it all in at once.

Can I use leftover bubble and squeak?
Yes. Use it as the filling, adding a little milk or butter if it has become firm in the refrigerator. Taste before adding salt, then fill baked potato shells and heat until the center reaches 165°F (74°C).

Do I have to use cabbage?
No. Cooked kale, Brussels sprouts or a mixture of leftover vegetables can stand in. Keep the total amount close to 2 cups (150 g) shredded cabbage by volume and weight where possible, and cook wetter vegetables until excess moisture has evaporated.

Can I cook the jacket potatoes in an air fryer?
Usually. After oiling and seasoning, air-fry them at 400°F (200°C) for roughly 35–50 minutes, turning once, until crisp outside and tender inside. Air fryer models and potato sizes vary, so check with a knife; finish the filled potatoes in the air fryer until browned and hot through.

Is bubble and squeak traditionally made with leftover vegetables?
It is commonly associated with cooking leftover potatoes and vegetables together, but recipes differ. This version combines freshly cooked mash and cabbage inside baked potato skins, giving the familiar combination a crisp, self-contained serving.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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