Recipe

Cast Iron Filet Mignon

A simple cast iron method for tender filet mignon with crispy edges and a fast garlic butter baste.

By Matt Campbell

•

4.8

A plated cast iron seared filet mignon sliced and topped with melting garlic butter, served with flaky salt on a warm ceramic plate at a softly lit dinner table

Filet mignon is the steak you cook when you want maximum tenderness with minimum drama. It is naturally lean, so the goal is not to bully it into submission. We are going for a hard, fast sear for those crisp edges, then a short oven finish to hit your exact doneness, then a rest so the juices stay where they belong.

This is my favorite weeknight-steakhouse move: cast iron, butter, garlic, thyme, and a little confidence. Taste as you go, keep a thermometer nearby, and do not be afraid to spoon hot butter over the top like you are painting a masterpiece.

Raw filet mignon steaks on a cutting board with kosher salt, black pepper, garlic cloves, fresh thyme, butter, and a small bowl of neutral oil on a clean kitchen counter

Why It Works

Steakhouse sear at home: Cast iron gets ripping hot, which means a browned crust without overcooking the center.
Perfect doneness on purpose: A quick oven finish plus a thermometer takes the guesswork out.
Big flavor for a lean cut: Butter basting with garlic and thyme adds richness without masking filet’s clean, beefy taste.
Low ingredient count: No marinades, no mystery rubs, just good basics used the right way.

Pairs Well With

Storage Tips

Refrigerate: Cool leftover filet, then store in an airtight container for up to 3 days.

Reheat gently (best method): Bring steak toward room temp for 15 minutes. Warm in a covered skillet over low heat with a teaspoon of water or a small pat of butter, flipping once, just until heated through.

Oven reheat option: Place steak on a sheet pan, cover loosely with foil, and warm at 250°F until it reaches about 95 to 105°F inside. Sear for 30 seconds per side if you want the crust to wake up again.

Skip the microwave if you can: Filet is lean, and the microwave loves turning it from tender to tight.

Leftover ideas: Slice thin for steak salad, tuck into a toasted baguette with horseradish mayo, or dice into an egg scramble with onions and mushrooms.

Common Questions

How do I know when filet mignon is done?

Use an instant-read thermometer and pull the steak a little early because carryover cooking is real. For filets around 1 1/2 inches thick, a good rule is to pull about 5°F early (sometimes up to 10°F, depending on thickness and how hot the pan is).

Rare: 120 to 125°F (pull at about 115 to 120°F)
Medium-rare: 130 to 135°F (pull at about 125 to 130°F)
Medium: 140 to 145°F (pull at about 135 to 140°F)

Then rest 5 to 10 minutes.

Should I marinate filet mignon?

Usually no. Filet is already tender, and most marinades are better for tougher cuts. Salt, pepper, and a butter baste deliver more “wow” with less fuss.

What is the best pan for filet mignon?

Cast iron is the classic because it holds heat and sears aggressively. Stainless steel also works. Nonstick is not ideal for high-heat searing.

Can I cook filet mignon without an oven?

Yes, especially if your filets are 1 to 1 1/2 inches thick. Sear, then lower the heat to medium-low and continue cooking, flipping every minute or so, until you hit your target internal temperature.

Why is my filet tough?

The usual culprits are overcooking, not resting, or starting with a steak that is too cold. Let it sit out for 20 to 30 minutes to take the chill off, and pull it at the right temperature.

Do I need to tie filet mignon?

If the steak is uneven or looks like it will “flop,” a simple loop of kitchen twine helps it cook more evenly. Many store-cut filets are already neat enough to skip it.

Matt Campbell

I have always had a huge passion for the culinary arts, people, working as a team, and so on. I wanted to pursue my love for cooking initially at Virginia Commonwealth University with a culinary arts degree; however, I instead decided to apply myself and acquire more practical skills. My end goal is to eventually open my own restaurant or similar establishment.

Kitchen Essentials

10 to 12 inch cast iron skillet
Oven-safe tongs
Instant-read thermometer
Paper towels
Small spoon for basting
Cutting board
Oven mitts or thick kitchen towels (for the hot skillet and handle)

Filet mignon used to intimidate me because it is expensive and kind of quiet. It does not have the dramatic fat cap of a ribeye to bail you out. The first time I nailed it, it was honestly because I stopped trying to be clever and just focused on the basics: dry the surface, season like you mean it, sear hard, then let the oven do the gentle part. Now it is my go-to “I cooked, but also I did not ruin my evening” dinner. Butter basting is the fun part, like you are giving the steak a little spa treatment before you eat it.

Cast Iron Filet Mignon

(4.8 Reviews)

Prep Time 10 minutes

Cook Time 10 minutes

Total Time 35 to 50 minutes

Servings 2

Ingredients

2 filet mignon steaks (6 to 8 oz each, about 1 1/2 inches thick)
1 1/2 tsp kosher salt (plus more to finish)
1 tsp freshly ground black pepper
1 tbsp neutral oil (avocado, canola, or grapeseed)
3 tbsp unsalted butter
2 garlic cloves, smashed
4 sprigs fresh thyme (or rosemary)
Optional: 1 tsp Dijon mustard stirred into the pan butter at the end

Close-up of filet mignon steaks seasoned with salt and pepper beside butter, smashed garlic, and thyme sprigs arranged on a wooden cutting board

Instructions

Take the chill off. Set filets out for 20 to 30 minutes. Pat them very dry with paper towels. Dry surface equals better crust. (Food safety note: do not leave steak out for more than 1 hour.)
Preheat the oven. Set oven to 400°F.
Season. Season all sides with kosher salt and black pepper. Do not be shy, especially on the sides. Optional upgrade: If you have time, salt the steaks 45 to 60 minutes ahead and keep them uncovered in the fridge for a quick dry-brine. Better seasoning, better crust.
Heat the skillet (and crack a window). Place a cast iron skillet over medium-high heat until it is very hot, about 3 to 5 minutes. You are looking for the moment the oil shimmers (and may lightly smoke). Add oil and swirl.
Sear. Add filets and sear 2 to 3 minutes without moving them. Flip and sear another 2 minutes. If you want, use tongs to sear the sides for 20 to 30 seconds each.
Butter baste. Reduce heat to medium. Add butter, smashed garlic, and thyme. When butter foams, tilt the pan and spoon the butter over the steaks for 30 to 60 seconds. If the butter starts browning too fast, lower the heat. We want nutty and fragrant, not scorched and bitter.
Oven finish. Transfer the skillet to the oven. Roast 3 to 6 minutes, then start checking temperature. Insert the thermometer into the thickest part of the center of the steak and avoid touching the pan. Thicker steaks will take longer, so trust the temp, not the minutes.
Safety: The skillet handle will be blazing hot. Use oven mitts or thick towels, and consider leaving a towel on the handle as a visual reminder while it rests on the stove.
Rest. Move steaks to a plate and rest 5 to 10 minutes. Spoon a little of the garlic butter over top. Finish with a pinch of flaky salt if you have it.
Safety: Keep that hot skillet handle out of the splash zone and away from curious hands. It stays hot longer than you think.
Serve. Slice against the grain and serve immediately. If using Dijon, stir it into the butter left in the pan and drizzle lightly over the sliced steak.
Safety: If you stir Dijon into the pan drippings, do it with mitts on and the pan on a stable burner. The handle is still hot, and the butter can sputter.