There’s something timeless about a steak dinner — simple, satisfying, and a little bit celebratory. If you enjoy a classic steak night, this filet mignon with mushroom and balsamic sauce is a great choice. The steak itself is tender and rich, while the mushroom sauce adds savory depth and a touch of acidity from the balsamic to balance the dish.
This recipe is straightforward and works well for a weeknight treat or an intimate weekend dinner. It uses common pantry ingredients and a cast-iron skillet for a beautifully seared crust. The mushrooms cook down into a soft, flavorful sauce that complements the filet without overpowering it.
Below you’ll find clear ingredient lists, step-by-step instructions, helpful tips for a perfect sear, and serving suggestions to make this steak dinner feel special.
Steaks with Mushroom Sauce
Ingredients
For the Filet:
- 2 filet mignon steaks (6–8 ounces each)
- 2 tablespoons avocado oil (or another high-heat oil)
- Kosher salt, to season
- Freshly cracked black pepper, to taste
For the Sauce:
- 2 cups baby bella mushrooms, thinly sliced
- 1/4 cup yellow onion, finely diced
- 1 teaspoon fresh thyme leaves
- 2 cloves garlic, minced
- Kosher salt, to taste
- Freshly cracked black pepper, to taste
- 1/4 cup beef broth
- 2 tablespoons balsamic vinegar
Instructions
For the Filet
- Pat the steaks dry with paper towels until thoroughly dry. Drying the surface helps achieve a better crust. Generously season both sides with kosher salt and freshly cracked black pepper.
- Preheat a cast-iron skillet over medium-high heat for several minutes until very hot. Add the oil and heat until it just begins to shimmer and almost smoke.
- Carefully place the filets in the hot skillet. Sear until a deep golden-brown crust forms on the first side, then flip and sear the second side. Cooking time depends on steak thickness and desired doneness; for 6–8 ounce filets, 2–4 minutes per side typically yields medium-rare to medium. Use an instant-read thermometer if you prefer precise doneness.
- Transfer the steaks to a plate and let them rest for several minutes while you prepare the sauce. Resting allows juices to redistribute for a juicier steak.
For the Sauce
- In the same skillet (use the pan drippings for flavor), add the diced onion and minced garlic. Cook over medium heat, stirring, until the onion begins to soften, about 1–2 minutes.
- Add the sliced mushrooms and a pinch of salt and pepper. Cook, stirring occasionally, until the mushrooms release their liquid and begin to brown, about 3 minutes.
- Stir in the fresh thyme, beef broth, and balsamic vinegar. Scrape up any browned bits from the bottom of the skillet to incorporate flavor into the sauce.
- Simmer, stirring occasionally, until the liquid reduces by roughly half and the sauce thickens slightly, about 3–4 minutes. Taste and adjust seasoning as needed.
- Spoon the mushroom-balsamic sauce over the rested filets and serve immediately.
Notes
Serve these filets with a simple side like hasselback potatoes or roasted vegetables and a fresh arugula salad dressed with olive oil and lemon. The rich mushroom sauce pairs particularly well with creamy or savory sides.
Tips for Success
- Make sure steaks are at or near room temperature before searing for even cooking.
- Dry the surface thoroughly to promote browning; moisture prevents a good crust.
- Use a heavy skillet, such as cast iron, for even heat and superior searing.
- Allow steaks to rest 5–7 minutes after cooking so they retain their juices when sliced.
- If you prefer a thicker sauce, reduce the broth slightly more, or finish with a small pat of butter off the heat for extra gloss and richness.
Nutrition information is automatically calculated by many recipe tools and should be considered approximate.
Additional Info
Author: Alex Snodgrass
Servings: 2 people
Like this recipe? Leave a comment below to share how your steaks turned out or any adaptations you tried.