Longhorn Mashed Potatoes Recipe: Steakhouse-Style Creamy Side

I’ve tested this copycat recipe in my tiny Boston kitchen until it matched Longhorn’s signature creamy texture. The secret lies in the perfect ratio of butter to cream, with just the right amount of garlic and seasoning.

This version uses simple ingredients and straightforward techniques to recreate that steakhouse experience at home. No fancy equipment required—just a pot, a masher, and about 30 minutes of your time.

What you’ll get are creamy, velvety mashed potatoes with rich flavor that pairs perfectly with steak or stands alone as a comforting side. They’re smooth without being gluey, and packed with that restaurant-quality taste.

Between you and me, these taste even better than the original. Here’s how to make them.

Ingredients for Longhorn Mashed Potatoes

Simple, high-quality ingredients deliver that steakhouse creamy texture you crave at home.

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The potatoes are everything here. Russets give that light, fluffy texture—avoid waxy varieties like red or Yukon Gold. I grab mine from Market Basket (they’ve got great prices and consistent quality). For the cream and butter, full-fat is non-negotiable—this isn’t the time for skim or margarine. The sour cream adds that tangy depth you taste in the restaurant version.

No heavy cream? Half-and-half plus a pat of butter gets you close. Out of sour cream? Full-fat Greek yogurt works (strain it first if it’s watery). Garlic powder can sub for fresh at one-third the amount, but fresh is better. For the milk, whole is best—2% will work, but the texture won’t be as velvety. And yes, real butter is the only way to go here.

Mashed potatoes don’t love the fridge—they thicken and dry out. But if you must, store in an airtight container for up to 3 days. Reheat with a splash of milk or cream. For make-ahead, prep everything except the mashing, then reheat the potatoes with the dairy. They’ll keep their fluff for 1 hour in a warm oven (170°F).

Step-by-Step Instructions for Steakhouse-Style Creamy Mashed Potatoes

Here’s the method I use to achieve that ultra-creamy, restaurant-quality texture every time.

Step 1: Boil the Russet Potatoes to Fork-Tender Perfection

Place the 2.5 lb peeled and cubed Russet Potatoes in a large pot and cover with cold water by about 1 inch. Add 1.5 tsp Salt to the water—it should taste slightly briny, like the sea. This seasons the potatoes from the inside out.

Bring to a boil over high heat, then reduce to a gentle simmer. Cook for 15-20 minutes until the potatoes are fork-tender—a knife or fork should slide in with no resistance. Drain immediately and return the potatoes to the pot. Let them sit for 1-2 minutes to allow excess moisture to evaporate; this prevents watery mashed potatoes.

Step 2: Infuse the Dairy with Garlic Flavor

While the potatoes cook, warm the 0.5 cup Whole Milk in a small saucepan over low heat until just steaming—don’t let it boil. In a separate microwave-safe bowl, melt the 0.75 cup Unsalted Butter in 20-second bursts, stirring between each, until just melted. Stir the minced 4 cloves Garlic Cloves into the melted butter and let it steep for 5 minutes to infuse the flavor.

This step ensures the garlic mellows into the butter, eliminating any harsh raw bite while distributing its aroma throughout the dish.

Step 3: Mash and Incorporate the Creamy Elements

Return the drained potatoes to the pot and mash them with a potato masher or ricer until smooth. Avoid using a food processor, as it can make the potatoes gummy. Gradually add the 1 cup Heavy Cream, warm Whole Milk, and garlic-infused Unsalted Butter, mixing well after each addition.

The mixture should be velvety and loose. Fold in the 0.5 cup Sour Cream and 0.5 tsp Black Pepper until fully combined. The sour cream adds a subtle tang and extra richness that defines that steakhouse style.

Step 4: Adjust Consistency and Garnish

Taste and adjust seasoning if needed—you may want a pinch more Salt depending on preference. For an ultra-smooth texture, stir vigorously with a wooden spoon for 1-2 minutes to incorporate air and lighten the mixture.

Transfer to a serving bowl and garnish with the 2 tbsp Chives and 2 tbsp Fresh Parsley. The herbs add a fresh, vibrant contrast to the creamy potatoes. Serve immediately while warm for the best texture.

Make-Ahead Tips for This Dish

Prep Ahead Strategy

Peel and cube the 2.5 lb Russet Potatoes up to 24 hours ahead. Store them submerged in cold water in the fridge to prevent browning. This saves 10 minutes on cooking day while keeping the texture perfect. 💡

Dairy Prep Tip

Measure and warm the 0.5 cup Whole Milk and 1 cup Heavy Cream together in a saucepan. Let them cool, then refrigerate in a covered container. The next day, gently reheat before combining with the potatoes.

Garlic Infusion

Mince the 4 cloves Garlic and mix with the 0.75 cup Unsalted Butter the night before. Store in an airtight container at room temperature. The flavors will meld beautifully overnight.

Final Assembly

Boil the prepped potatoes as directed, then mash and combine with your prepped dairy and garlic butter. Fold in the 0.5 cup Sour Cream last for the creamiest texture. 🥄

Holding for Service

Transfer the finished mashed potatoes to a heatproof dish and cover tightly with foil. They’ll stay warm in a 170°F oven for up to 1 hour without drying out.

Reviving Leftovers

Add a splash of warm milk or cream and stir vigorously over low heat to restore the creamy consistency. This works for up to 3 days of refrigerated leftovers.

Frequently Asked Questions