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Pull one of these off the pan and look at the seam.

That is where the butter went.

A Parker House roll is folded over a slick of melted butter before it ever sees the oven, and that fold is not decoration. It is the entire reason the roll tastes richer than the dinner roll sitting next to it.

The two halves bake into one soft roll with a buttery layer running through the middle.

I did not know any of this until I made a batch that came out flat and open, every fold gaping like a book left face down.

Turns out I was folding them straight down the middle. Off center is the answer, and I will show you exactly how.

The sweet potato is the second half of the story.

It puts starch and moisture into the dough, which means the crumb stays soft on day two instead of turning into a bread roll you have to microwave to enjoy.

Fair warning: my wife requests these every single year now, and the batch of 16 has never once made it to the leftovers.

The Parker House hotel in Boston came up with the original back in 1855, and they also gave us Boston cream pie, so clearly somebody there was doing something right.

What Makes a Parker House Roll

The fold is the definition. Take away the fold and you have a very nice dinner roll, which is a different thing.

Here is the difference people search for constantly.

A dinner roll is shaped into a ball and baked. The crumb is even all the way through.
A Parker House roll is rolled flat, cut into rounds, brushed with melted butter, and folded over on itself. The butter is trapped inside the fold, so it bastes the crumb from the inside as it bakes.

They bake crowded together in one pan so the sides stay soft and the whole thing pulls apart at the table.

The tops get an egg wash and, in my kitchen, more butter and a pinch of flaky salt the second they come out.

Why Sweet Potato Belongs in This Dough

Potato in bread dough is an old trick and it works for a specific reason. The starch holds onto water that flour alone would give up.

Softer crumb. The dough carries more moisture without turning slack, so the rolls bake up pillowy rather than tight.
Slower staling. Day two rolls are still soft. This matters more than anything else at a holiday when you bake ahead.
A faint sweetness. Not dessert sweetness. Just enough that the salted butter tastes saltier by contrast.
Color. A warm gold crumb that plain white rolls do not have.

Worth the extra sweet potato step? Every time.

Ingredients You Will Need

Mashed roasted sweet potato (1 cup, cooled). About 1 large sweet potato. Cool it fully or it will kill the yeast.
All purpose flour (3 ½ cups). Not bread flour. We want pillowy, not chewy, and the extra protein works against you here.
Instant yeast (2 teaspoons). Goes straight into the dry ingredients.
Granulated sugar (3 tablespoons). Feeds the yeast and helps the tops brown.
Fine salt (1 ½ teaspoons). Balances the sweet potato.
Whole milk (¾ cup, warmed). Richness and tenderness. Buttermilk works too and adds a little tang.
Egg (1 large). Structure and a richer crumb.
Softened salted butter (4 tablespoons). Worked into the dough.
Melted salted butter (6 tablespoons). The important one. This goes into the fold and over the tops.
Egg wash (1 egg plus 1 tablespoon water). Gives that glossy, deep gold finish.
Flaky sea salt. Over the hot rolls. This is what keeps them reading as dinner rolls and not dessert.

Ingredient Notes and Substitutions

Roasted versus boiled versus canned sweet potato. Roasted is driest and best. Boiled is wetter and canned is wettest, so with either one hold back 2 tablespoons of the milk.
Buttermilk instead of milk. A straight swap. Slightly tangier, slightly more tender.
Active dry yeast. Bloom it in the warm milk with the sugar for 10 minutes first.
Unsalted butter. Use it and add another ¼ teaspoon of salt to the dough.
Honey instead of sugar. Use 2 tablespoons and reduce the milk slightly.

How to Make Sweet Potato Parker House Rolls

Step 1: Roast and Mash

Roast a large sweet potato at 400°F for 55 to 65 minutes.

Scoop the flesh out, mash it smooth, and spread it on a plate so it cools fast.

It must be at room temperature before it meets the yeast.

Step 2: Mix the Dough

In a stand mixer, combine the warm milk, sugar, yeast, egg and the cooled mash.

Add the flour and salt and mix on low until a shaggy dough forms.

Add the softened butter a tablespoon at a time with the mixer running.

Step 3: Knead

Knead on medium for 8 to 10 minutes.

The dough should be soft, smooth and just barely tacky.

It will look wetter than a standard roll dough. That is the sweet potato and it is correct.

Step 4: First Rise

Cover and let it rise in a warm spot for 1 hour to 1 hour 15 minutes, until doubled.

Step 5: Roll and Cut

Turn the dough onto a lightly floured counter and roll it to an even ½ inch thick.

Cut 16 rounds with a 3 inch cutter, re-rolling the scraps once.

Step 6: Butter and Fold

Brush every round with melted butter, then fold. Full instructions in the next section, because this is the part that matters.

Step 7: Second Proof

Arrange the folded rolls in a buttered 9x13 inch pan, seams facing the same direction, crowded so they touch.

Cover and proof 35 to 45 minutes, until puffy and pressed together.

Step 8: Bake

Brush with the egg wash and bake at 350°F for 20 to 25 minutes, until the tops are deep gold.

Step 9: Butter Again

Brush the hot rolls with the last of the melted butter and finish with flaky salt.

Let them sit 10 minutes before you pull the pan apart.

How to Fold a Parker House Roll

An off center fold stays shut and a centered fold springs open. That is the whole secret and nobody told me for years.

Here is the sequence.

Roll to an even thickness. ½ inch, all the way across. Thin spots bake dry and thick spots stay doughy.
Cut clean rounds. Press straight down with the cutter, no twisting. Twisting seals the edge and the roll cannot rise properly.
Press a crease off center. Lay the handle of a wooden spoon across each round, slightly past the middle, and press down firmly to make a hinge.
Brush the whole round with melted butter. Edge to edge. This is the seam of butter you are building.
Fold the larger half over the smaller. The top edge should overhang the bottom edge by about ¼ inch.
Press the seam lightly. Just enough to tack it. Do not crimp it shut.

Why does the overhang work? Because the dough expands in the oven, and a top layer that starts longer has somewhere to go. A centered fold has both halves pushing against each other and the roll opens like a clamshell.

Pro tip: face all the seams the same way in the pan. They brace against each other during the second proof.

Recipe Tips

Weigh your flour if you can. Sweet potato moisture varies enough to swing the dough by half a cup.
Cool the mash completely. Warm mash plus yeast equals a dough that never rises properly.
Do not over flour a sticky dough. Oil your hands instead. Every extra tablespoon of flour costs you softness.
Crowd the pan. Rolls that touch rise up rather than out and stay soft on the sides.
Watch the color, not the clock. Deep gold, not pale tan. Pale rolls taste underbaked and go gummy as they cool.
Rest before serving. Ten minutes lets the crumb set. Pull them apart immediately and the middles compress.

Make the Dough Ahead

Cold overnight bulk rise. Mix the dough, then refrigerate it for 8 to 16 hours instead of the counter rise. The flavor gets better and the cold dough rolls out beautifully.
Shaping from cold. Roll and fold straight from the fridge. Cold dough holds a crease better than warm dough does.
The shaped pan. Cover and refrigerate the folded rolls up to 12 hours. Let the pan sit at room temperature for 60 to 75 minutes before baking so they finish proofing.
Baking ahead. Bake fully, cool, and reheat covered in foil at 300°F for 12 minutes. Brush with fresh butter on the way out.

Variations

Honey butter fold. Whisk 2 tablespoons of honey into the melted butter before you brush the rounds.
Garlic and herb. Add 2 grated cloves of garlic and 1 tablespoon of chopped thyme to the brushing butter.
Brown butter. Cook the butter until it smells nutty and the solids go amber, then use it in the fold. This is the version I make when I want people to ask questions.
Cinnamon sugar. Sprinkle the buttered rounds with cinnamon sugar before folding for a breakfast batch.

What to Serve With Them

A holiday roast. Turkey, ham, prime rib. These were built for that table.
Soup and chili. The fold gives you a natural place to tear.
Gravy. Mopping duty is the highest calling of a Parker House roll.
Next day ham sandwiches. Split along the fold, add leftover ham and mustard, and you have lunch.

Storing and Reheating

Room temperature. In a sealed bag, 2 to 3 days. The sweet potato really does keep them soft.
Freezer. Baked and cooled rolls freeze for 3 months in a zip bag.
Reheating. Wrap in foil and warm at 300°F for 12 to 15 minutes. Add butter after, never before.
What not to do. Microwaving turns them soft for ninety seconds and rubbery forever after.

Recipe

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Buttery Sweet Potato Parker House Rolls

Soft, folded sweet potato dinner rolls with a seam of melted butter baked inside, finished with egg wash and flaky salt.

Keyword buttery sweet potato parker house rolls

Prep Time 30

Cook Time 22

Total Time 2 40

Servings rolls

Ingredients

For the Dough

1 cup mashed roasted sweet potato cooled to room temperature, about 1 large
3 ½ cups all purpose flour plus more for rolling
2 teaspoons instant yeast
3 tablespoons granulated sugar
1 ½ teaspoons fine salt
¾ cup whole milk warmed
1 large egg
4 tablespoons salted butter softened

For the Fold and Finish

6 tablespoons salted butter melted
1 large egg beaten with 1 tablespoon water, for the wash
flaky sea salt for finishing

Instructions

Make the Dough

Roast a large sweet potato at 400F for 55 to 65 minutes, until completely tender. Scoop out the flesh, mash it smooth, and spread it on a plate to cool to room temperature.
In a stand mixer, combine the warm milk, sugar, instant yeast, egg and cooled sweet potato mash. Add the flour and salt and mix on low until a shaggy dough forms.
With the mixer running, add the softened butter one tablespoon at a time. Knead on medium for 8 to 10 minutes, until the dough is soft, smooth and just barely tacky.
Cover and rise in a warm spot for 1 hour to 1 hour 15 minutes, until doubled.

Fold and Bake

Turn the dough onto a lightly floured counter and roll it to an even ½ inch thick. Cut 16 rounds with a 3 inch cutter, pressing straight down without twisting. Re-roll the scraps once.
Press a crease slightly off center across each round with the handle of a wooden spoon. Brush the whole round with melted butter, then fold the larger half over the smaller so the top edge overhangs by about ¼ inch. Press the seam lightly.
Arrange the folded rolls in a buttered 9x13 inch pan with all the seams facing the same direction, crowded so they touch. Cover and proof 35 to 45 minutes, until puffy.
Brush with the egg wash and bake at 350F for 20 to 25 minutes, until the tops are deep gold.
Brush the hot rolls with the remaining melted butter and sprinkle with flaky salt. Rest 10 minutes before pulling them apart.

Notes

Fold off center: A centered fold springs open in the oven. An overhang of about ¼ inch on the top half is what keeps the roll shut.
Cool the mash: Warm sweet potato will kill the yeast. Spread it on a plate to speed it up.
Moisture varies: Boiled or canned sweet potato is wetter than roasted, so hold back 2 tablespoons of the milk.
Make ahead: Refrigerate the shaped pan up to 12 hours, then let it sit at room temperature 60 to 75 minutes before baking.
Storage: Sealed at room temperature 2 to 3 days, or frozen 3 months. Reheat wrapped in foil at 300F for 12 to 15 minutes.