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Filet Diane With Roasted Garlic Mashed Potatoes Recipe

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This one is for all the steak lovers craving a retro and classic dish without making a reservation at a fancy steakhouse! Nothing tastes better than this delectable combination of tender, juicy filet mignon, and earthy, creamy Diane steak sauce. The best part? It’s less expensive and less crowded because you’re at home! You’ll find what you crave with our Filet Diane With Roasted Garlic Mashed Potatoes recipe.

Why We Love This Filet Diane with Roasted Garlic Mashed Potatoes Recipe

Recreating a steakhouse-style dish can seem like a lot of work, but achieving restaurant-worthy perfection is easier than you think! This delightful recipe features a fork-tender filet mignon on a creamy bed of mashed potatoes, topped with earthy mushrooms and a rich cognac sauce. After one bite, you’ll forget you’re not at a restaurant.

Tools You’ll Need Before You Start

  • 1 Large Saucepan
  • 1 Cutting Board
  • Whisk
  • Meat Thermometer

How to Make Filet Diane With Roasted Garlic Mashed Potatoes

Traditionally, this steak dish features a standard tenderloin, but we’re using the very best part of the tenderloin from America’s Original Butcher: Omaha Steaks Butcher’s Cut Filet Mignon. These filets are trimmed twice by master butchers to remove exterior fat and aged at least 30 days for maximum tenderness. It’s a fork-tender steak experience guaranteed to please!

1. These Filets are Sear-ously Perfection

Pan-seared filet mignons are delicious! Start by thawing your filet in the refrigerator overnight or using our convenient quick-thaw method. Once thawed, pat dry and liberally season each filet with salt and pepper. Allow them to come to room temperature on the counter for about 20 minutes.

Once steaks have reached room temperature, add some grapeseed oil to a saucepan and bring to medium-high heat. Next, place the filets in the large saucepan and cook for about three minutes until an excellent crust forms. Then flip your filets, add your creamy butter, baste for another 30 seconds, and cook for about two minutes for medium-rare doneness of 130 degrees Fahrenheit as per a meat thermometer. Refer to our helpful steak doneness guide for different desired cooking doneness. Remove the filets from the pan and rest on a cutting board for five minutes.

2. Let’s Get Saucy

Diane sauce is the perfect way to infuse your filet mignon with the umami flavor of mushrooms and the sweet taste of cognac or brandy! Add meaty portobello mushrooms with salt and pepper to the still-hot filet pan, sautéing for about 90 seconds. Then add the minced shallots and sliced garlic to the same pan and sauté for another 30 seconds. Turn the burner off and add in the cognac or brandy to deglaze the pan. Use caution, as the alcohol will produce flames.

Once the flames have calmed down, set the burner to medium-high heat and cook the alcohol for one minute. Then add the slightly sweet tomato paste, cooking for another 30 seconds. Add the rich beef stock, creamy heavy cream, spicy Dijon mustard, and savory Worcestershire sauce, whisking everything together. Bring to a boil and cook for about four minutes until the consistency is sauce-like. Stir in the mild chives and season to taste with salt and pepper.

3. Ditch the Complicated Mashed Potatoes

We make preparing mashed potatoes easy! Follow the instructions on the package of our velvety-smooth Roasted Garlic Mashed Potatoes. They’re easy to prepare in the microwave or oven. Give yourself some extra time if preparing the mashed potatoes in the oven.

Now that everything is ready, let’s assemble! First, place a spoonful of garlic mashed potatoes on the plate, top with a seared filet mignon, and finish with the Diane sauce. Then, dig in!

 

Filet Diane With Roasted Garlic Mashed Potatoes

This classic steakhouse-style recipe features a fork-tender filet mignon on a creamy bed of mashed potatoes, topped with earthy mushrooms and a rich cognac sauce
Prep Time10 mins
Cook Time15 mins
Total Time25 mins
Course: Main Course
Cuisine: French
Keyword: Steak Diane Recipe
Servings: 4 servings
Author: Chef David Rose

Ingredients

Filet Mignons

Diane Sauce

  • 8 oz. baby portobello mushrooms, thinly sliced
  • 1/2 cup cognac or brandy
  • 1/2 cup heavy cream
  • 1/2 cup beef stock
  • 1/2 whole shallot, minced
  • 2 garlic cloves, thinly sliced
  • 1 tablespoon tomato paste
  • 1 teaspoon Dijon mustard
  • 2 teaspoons Worcestershire sauce
  • 1 tablespoon chives
  • Kosher salt
  • Pepper

Garlic Mashed Potatoes

Instructions

Filet Mignons

  • Thaw filets in refrigerator overnight; remove from refrigerator, pat dry with paper towels, and season liberally with salt and pepper; allow to come to room temperature over about 20 minutes.
  • Add grapeseed oil to large saucepan and bring to medium-high heat.
  • Sear filets for about 3 minutes on one side, until a nice crust has formed, then add butter, flip filets, and butter baste for about 30 seconds; continue to cook for about 2 minutes for medium-rare doneness. For a different steak doneness, refer to the Omaha Steaks cooking chart.
  • Remove filets from pan and place on cutting board to rest for 5 minutes.

Diane Sauce

  • Add mushrooms and pinch of salt and pepper to still-hot filet pan and sauté for about 90 seconds, then add shallots and garlic and sauté for another 30 seconds.
  • Then turn off burner, add cognac or brandy, and deglaze pan. Chef’s Note: Alcohol will produce flames once added, use caution.
  • Wait for flames to die down, then set burner to medium-high again.
  • Cook until alcohol is reduced to 1/3 in volume, about 1 minute, then add tomato paste and cook for about 30 seconds.
  • Add beef stock, heavy cream, Dijon mustard, and Worcestershire sauce and whisk all ingredients until fully incorporated; bring to a boil and then reduce to medium heat. Cook for about 4 minutes, until reduced to 2/3 in volume and sauce-like consistency.
  • Stir in chives and season to taste with salt and pepper.
  • Plating: Place garlic mashed potatoes on plate first, top with seared filet, and finish with Diane sauce.

Garlic Mashed Potatoes

    Microwave Instructions:

    • Do not thaw.
    • Remove plastic overwrap and place in microwave.
    • Cook on high for 3-4 minutes.
    • Stir and cook for one additional minute or until potatoes reach 165 degrees Fahrenhiet, as indicated by a food thermometer.
    • Remove from microwave, stir, let stand 2 minutes, and serve.

    Oven Instructions:

    • Do not thaw.
    • Preheat oven to 350 degrees Fahrenheit.
    • Remove plastic overwrap and place on oven-safe baking sheet.
    • Place on center rack in oven and cook for 45-50 minutes for or until potatoes reach 165 degrees Fahrenheit, as indicated by a food thermometer.
    • Remove from oven, stir, let rest 2 minutes, and serve.

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