Creamy Mushroom Steak Frites Sandwich

How to Make a Creamy Mushroom Steak Frites Sandwich

If you’re looking for the ultimate comfort food mashup, this Creamy Mushroom Steak Frites Sandwich brings together two classics — steak frites and a hearty steak sandwich — into one mouthwatering creation. Perfectly grilled ribeye, crispy Cajun-seasoned fries, and a rich, creamy mushroom sauce all come together on toasted ciabatta for an unforgettable bite.

This sandwich delivers everything you love about a steak dinner — seared meat, buttery mushrooms, and golden brown fries — in handheld form. It’s indulgent, flavorful, and perfect for your next weekend cookout or special dinner at home.

Ingredients you will need for Creamy Mushroom Steak Frites Sandwich

For the Steak Sandwich:

• 1 pound ribeye steak
• 2 tbsp steak seasoning
• 2 russet potatoes, thinly sliced as possible
• 2 tbsp Cajun rub
• ¼ cup chives, thinly sliced
• Olive oil, for brushing
• Ciabatta rolls, toasted

Creamy Mushroom Sauce:

• 8 oz portobello mushrooms, thinly sliced
• ½ large onion, thinly sliced
• 2 cups heavy cream
• ½ cup freshly grated Parmesan
• 4 oz bourbon
• 2 tbsp W Sauce
• 1 tbsp flour
• 1 tbsp rosemary
• 1 tbsp thyme
• 1 cup beef broth
• 1 tbsp SPG (salt, pepper, garlic blend)

How to make a Creamy Mushroom Steak Frites Sandwich

Step 1: Prep and Season the Steak

Start with a 1-pound ribeye steak, one of the most flavorful cuts of beef for sandwiches. Season both sides generously with your favorite steak seasoning and let it sit at room temperature for about 30 minutes.

Allowing the steak to warm slightly ensures even cooking and helps achieve that perfect sear over high heat.

Brush the steak lightly with olive oil to help it develop a golden crust on the grill.

Step 2: Grill the Steak

Preheat your grill to high heat, creating a direct cooking zone for the perfect sear. Grill the steak for about 3–4 minutes per side, flipping occasionally until it reaches an internal temperature of 127°F for medium-rare.

Once the steak is done, remove it from the grill and let it rest for at least 15 minutes. Resting helps the juices redistribute throughout the meat, keeping it tender and juicy when sliced.

Step 3: Make the Creamy Mushroom Sauce

While the steak rests, start preparing your rich and savory mushroom sauce. In a skillet over medium heat, melt 2 tablespoons of butter and add the thinly sliced mushrooms and onions. Sauté for 7–8 minutes until they become soft and slightly caramelized.

Next, season with SPG, rosemary, and thyme, then sprinkle in 1 tablespoon of flour. Stir for 3–4 minutes to form a light roux, which will help thicken the sauce.

Deglaze the pan with bourbon, scraping up any browned bits for extra flavor.

Stir in the W Sauce, heavy cream, and beef broth, then simmer until the sauce thickens to a creamy consistency. Finally, add freshly grated Parmesan cheese to make it rich and velvety.

Step 4: Prepare the Frites

To create the “frites” (thin French fries), slice your russet potatoes as thinly as possible using a mandolin or sharp knife. Soak the potato slices in cold water for 30 minutes — this helps remove excess starch, resulting in crispier fries.

Pat the potatoes dry thoroughly with paper towels, then fry them in oil at 350°F until they’re crispy and golden brown. Once done, transfer them to a bowl and toss with Cajun rub for a spicy, smoky kick.

Step 5: Assemble the Sandwich

Slice the rested ribeye thinly against the grain. Toast your ciabatta rolls until lightly crisp, then start assembling your sandwich.

Layer the bottom half with slices of steak, spoon over a generous amount of the creamy mushroom sauce, and top with a handful of crispy frites. Sprinkle with chives for freshness and color, then cap with the top bun.

The result? A juicy, flavorful steak sandwich that balances creamy, crispy, and smoky elements in every bite.

Pro Tips for the Perfect Steak Frites Sandwich

• Use High Heat: A hot grill or skillet ensures your ribeye develops a perfect crust while keeping the interior tender.
• Don’t Skip the Rest: Letting your steak rest after grilling locks in juices, making every slice moist and flavorful.
• Cold Water Soak: Always soak your potatoes before frying for maximum crispiness.
• Golden Brown Fries: Fry in small batches to avoid overcrowding, which helps the fries cook evenly and stay crispy.
• Customize It: Swap out the ciabatta for a brioche bun or add caramelized onions for extra depth.

Serving Suggestions

Serve your Creamy Mushroom Steak Frites Sandwich with a side of garlic aioli, a crisp green salad, or extra frites for dipping. Pair it with a cold beer, bourbon cocktail, or a glass of red wine for a meal that feels both indulgent and elevated.

This recipe turns a restaurant-style steak dinner into a portable masterpiece that’s perfect for game day, date night, or any time you want to impress. Whether you’re a grill enthusiast or just love a good steak sandwich, this dish delivers the rich flavors and satisfying textures of true comfort food.

More Delicious Recipes to try!

Steak Frites with Chimichurri:
Tender seared steak served alongside crispy golden fries, finished with a bright, herby chimichurri sauce that adds a burst of freshness and spice to every savory bite.

Cowboy Butter Steak Frites Sandwich:
A juicy grilled steak sandwich topped with crispy fries and drenched in zesty cowboy butter, packed with garlic, herbs, and lemon for a rich, flavorful bite every time.

Steak Bites with Mashed Potatoes and Gravy:
Juicy steak bites seared to perfection and served over creamy mashed potatoes, smothered in rich homemade gravy for the ultimate hearty, comforting steakhouse-style meal.

Steak with Bone Marrow Chimichurri:
Perfectly grilled steak paired with luxurious roasted bone marrow and drizzled with vibrant chimichurri, delivering a bold mix of richness, freshness, and irresistible umami flavor.

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