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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.