The BEST Mashed Potatoes Recipe (Creamy, Buttery + A Simple Umami Boost)

No holiday meal feels complete without a big bowl of creamy, dreamy mashed potatoes. These are buttery, fluffy, and super easy—the kind of side dish that disappears fast (and yes, people go back for “just one more scoop”).

And I’m adding one small twist here: a tiny splash of light soy sauce or a touch of oyster sauce. It sounds a bit unexpected, but it gives your mashed potatoes a deeper, more savory flavor—especially if you’re serving them with gravy, steak, or roast meats. Not required, but… kinda hard to un-know once you try it.

Creamy buttery mashed potatoes in a bowl.

Why These Mashed Potatoes Always Work

• • Simple ingredients (nothing fancy, but done the right way)

  • Buttery + creamy texture without being gluey

  • Works with almost everything: turkey, roast beef, Salisbury steak, beef tips… you name it

  • Optional: umami boost using light soy sauce or oyster sauce to make the flavor pop

The Best Potatoes for Mashed Potatoes

If you want the fluffiest, most classic mashed potatoes:

• • Russet / Idaho potatoes = high starch, fluffy texture

  • Yukon Gold = naturally buttery and creamy, slightly denser

If you use Yukon Gold, you can leave a little skin on for texture. Russets have tougher skin, so I’d peel them.

Tip (if you have time): you can bake potatoes instead of boiling—great flavor—but boiling is faster and totally reliable.

Best potatoes for mashed potatoes: Russet and Yukon Gold.

Ingredients (Classic + Optional Umami)

This recipe keeps it classic, but gives you two easy flavor upgrades.

Classic Ingredients

• • 3 lb (about 1.3–1.5 kg) potatoes (Russet/Idaho or Yukon Gold)

  • 1/2 cup butter (1 stick / 113g)

  • 3/4 cup warm whole milk (add more as needed)

  • Salt & black pepper, to taste

Optional (but really nice)

• • 2–4 cloves garlic (boil with potatoes for a gentle garlic flavor)

  • Chives or green onions (stir in at the end)

Optional Umami Boost (choose one)

• Light soy sauce: 1 to 2 teaspoons (start small)
  Sauce Grandmaster Light Soy Sauce (Amazon): https://www.amazon.com/dp/B0FMJTRFFV

• Oyster sauce: 1/2 to 1 teaspoon (adds savory + a tiny sweetness)
  Sauce Grandmaster Oyster Sauce (Amazon): https://www.amazon.com/dp/B0CH7ZWL62

Important: If you use soy sauce or oyster sauce, reduce the salt a bit, then taste at the end. Easy.

Mashed potatoes ingredients with an optional soy sauce umami boost.

Pro Tips for Perfection (No Gummy Potatoes)

• • Drain well: let potatoes sit in the colander for 2–5 minutes

  • Dry them out a bit: return them to the warm pot for 1–2 minutes (steam off extra moisture)

  • Mash by hand: potato masher or ricer = best texture
    (A mixer can work, but overmixing = gluey. Been there.)

  • Heat the milk/cream: cold dairy cools the potatoes and doesn’t absorb as nicely

  • Butter first, milk second: butter coats starch and helps keep things smooth

Draining and drying potatoes for fluffy mashed potatoes.

How to Make Mashed Potatoes (Step-by-Step)

1) Peel and cut

Peel potatoes (or leave some Yukon skin on). Cut into quarters.
Place into a large pot and cover with cold salted water (cold water helps them cook evenly).

2) Boil until tender

Bring to a boil and cook until fork-tender, usually 12–15 minutes depending on size.
A fork should slide in easily.

3) Drain and dry

Drain well. Let sit 2–5 minutes.
Return to the warm pot for 1–2 minutes to evaporate extra moisture.

4) Mash

Mash by hand (or use a ricer).
Add melted butter first, then slowly add warm milk until you reach your ideal texture.

5) Season (and add the umami boost if using)

Start with salt + pepper.
Then add either:

• • 1–2 tsp light soy sauce or

  • 1/2–1 tsp oyster sauce

Taste. Adjust. Done.

Mashing potatoes with butter for creamy mashed potatoes.

Make-Ahead Mashed Potatoes (Holiday-Friendly)

Make as written, cool completely, store airtight in the fridge.

To reheat for serving:

• • Spread into a greased casserole dish

  • Dot with butter, cover

  • Bake at 325°F (163°C) for 35–40 minutes until hot

  • For a browned top, uncover for the last 10 minutes

Make-ahead mashed potatoes in a casserole dish.

Things to Add to Mashed Potatoes (Optional Add-Ins)

If you want to switch it up:

• • Sour cream / Greek yogurt / cream cheese

  • Cheddar / parmesan / gouda

  • Roasted garlic or garlic powder

  • Fresh herbs (chives, parsley)

  • Caramelized onions

  • Extra butter on top (no judgment)

If you’re doing the soy sauce or oyster sauce version, I’d keep the add-ins simple so the flavor stays clean and savory.

Freezing Leftovers

Yes, you can freeze them. They reheat best with a little dairy:

• • Freeze in a bag, press flat

  • Reheat and add about 1 tbsp milk per cup of mashed potatoes

  • Oven or microwave, stir occasionally

Quick FAQ

What are the best potatoes for mashed potatoes?
Russet/Idaho for fluffy texture, Yukon Gold for buttery creamy texture.

How do I avoid gummy mashed potatoes?
Drain/dry well, mash by hand, and don’t overmix.

Can I add soy sauce to mashed potatoes?
Yes—start with 1 teaspoon. It adds savory depth. Just reduce salt and taste as you go.

Can I add oyster sauce to mashed potatoes?
Yes—use a small amount (about 1/2 teaspoon). It adds umami with a slight sweetness.

If you want to try the umami version, start with a tiny splash of light soy sauce:
Sauce Grandmaster Light Soy Sauce (Amazon): https://www.amazon.com/dp/B0FMJTRFFV
Oyster sauce option: Sauce Grandmaster Oyster Sauce (Amazon): https://www.amazon.com/dp/B0CH7ZWL62

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