Leftover mashed potato is one of the more difficult leftovers to make appealing a second time. Reheated it goes gluey. Fried into cakes it is fine but takes attention at the stove.
This turns it into twelve individual puffs baked in a muffin tin, golden and crisp outside and soft and cheesy inside. Ten minutes of mixing, twenty five in the oven, no standing over a pan.
Use the potatoes cold
Straight from the refrigerator, and this is the instruction the recipe is most specific about.
Cold mashed potato is firmer and holds its structure, so the mixture stays thick enough to hold a shape in the muffin cup. Warm or freshly made mash is looser and wetter, and the puffs spread and slump rather than rising.
Cold potato also has retrograded starch, which is a technical way of saying the starch molecules have rearranged into a firmer network as they cooled. That firmness works in your favour here.
The eggs are the structure
Two large eggs, beaten before they go in.
Mashed potato on its own has no binding power once heated, which is why plain mash reheated in a muffin tin would just sit there. The eggs set as they bake and hold everything together into something you can pick up.
Beating them first matters. Whole eggs dropped into a stiff potato mixture take a lot of stirring to distribute, and overworking mash makes it gluey.
Flour and sour cream, working against each other
A quarter cup of flour and a third of a cup of sour cream.
The flour absorbs moisture and firms the mixture up. The sour cream adds moisture and fat and keeps the inside soft and creamy rather than dense.
Together they land the texture in the right place. Dropping the flour gives you puffs that are too wet to hold. Dropping the sour cream gives you something closer to a potato scone, dry through the middle.
Two cheeses again
A cup of shredded cheddar or mozzarella through the mixture, plus two tablespoons of grated parmesan.
The shredded cheese melts into pockets through the inside. The parmesan is drier and saltier and it browns, so it contributes to the golden top and adds a savoury note that the milder cheese does not.
Cheddar gives more flavour, mozzarella gives more stretch. Either works and the choice is yours.
Grease the tin generously
The recipe says generously and it means it.
Potato and melted cheese together will weld themselves to a muffin tin. Nonstick spray applied thoroughly, getting right into the corners of each cup, is the difference between twelve intact puffs and twelve broken bottoms.
Paper liners are not a good option here. The puffs stick to the paper and you lose the crisp exterior that is the whole point.
Three quarters full, no more
Spoon the mixture in and smooth the tops with the back of a spoon.
Three quarters is deliberate. These rise a little as the eggs set and the cheese expands, and overfilled cups spill over the top and fuse to each other and to the surface of the tin.
Smoothing the tops is not just cosmetic. A rough surface with peaks means those peaks brown much faster than the rest and can burn before the middle sets.
Twenty to twenty five minutes
375F, until the tops are golden brown and the puffs are set and pulling slightly away from the sides of the tin.
That pulling away is the reliable cue. As the puffs bake they firm up and contract slightly, leaving a thin gap at the edge. Before that happens they are still soft in the middle.
Cool five minutes before removing
The most important five minutes in the recipe.
Straight out of the oven they are still soft and the eggs have not finished setting. Trying to lift one out at that point tears it apart. Five minutes lets them firm up and contract further, which also loosens them from the sides.
Run a knife around each one, then lift out. They should come free cleanly.
Serving them
Warm, with sour cream or ranch dressing for dipping.
They work as breakfast, as a side with roast meat, or as an appetiser at a party, which is a wider range than most leftover dishes manage. Around 145 calories each, twelve from three cups of mash.
Chives are the only fresh element in there and worth including. Two tablespoons chopped through the mixture cuts the richness of potato, cheese and sour cream.
Reheating
These keep three days refrigerated. Reheat in a hot oven or an air fryer rather than a microwave, which turns the outside soft and defeats the purpose. Around eight minutes at 350F brings the crisp back.
Additions
Crumbled cooked bacon, chopped spring onion, or a spoonful of caramelised onion all stir in well. Keep any additions modest by volume, since too much extra bulk stops the mixture binding properly.
Leftover Mashed Potato Cheese Puffs
Description
Leftover mashed potatoes baked in a muffin tin with cheddar, parmesan, sour cream and chives into crisp cheesy puffs.
Ingredients:
Instructions
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Preheat the oven to 375F. Generously grease a standard 12-cup muffin tin with nonstick cooking spray.
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In a large mixing bowl combine the cold mashed potatoes shredded cheese beaten eggs sour cream flour Parmesan chopped chives and salt. Stir until evenly combined.
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Spoon the mixture evenly into the prepared muffin cups, filling each about three-quarters full. Smooth the tops with the back of a spoon.
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Bake 20 to 25 minutes, until the tops are golden brown and the puffs are set and pulling slightly away from the sides of the tin.
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Remove from the oven and let cool in the tin 5 minutes.
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Run a knife around each puff, lift out carefully and serve warm with sour cream ranch dressing or your favourite dipping sauce..
Note
Use cold leftover mashed potatoes straight from the refrigerator; warm or freshly made mash is too loose and the puffs will slump. Grease the muffin tin generously rather than using paper liners, which stick and stop the outside crisping. Fill each cup only three-quarters full and smooth the tops. Let the puffs cool 5 minutes before removing so they hold their shape. Source lists 145 calories each. Keeps 3 days refrigerated; reheat in a hot oven or air fryer rather than a microwave.
