Cast Iron Filet Mignon (Seared + 500°F Oven, Medium Rare)

Name: Cast Iron Filet Mignon (Seared + 500°F Oven, Medium Rare)
Prep time: 10 min
Cook time: 12 min
Total time: 30 min
Ingredients: For the steaks:; 2 center-cut filet mignon steaks, about 1.5 inches thick (6–8 oz each); 1 teaspoon kosher salt; 1/2 teaspoon freshly cracked black pepper; 1 tablespoon avocado oil or grapeseed oil; For the baste (optional):; 2 tablespoons unsalted butter; 2 garlic cloves, smashed; 2 sprigs fresh thyme or rosemary; To finish:; Flaky finishing sea salt (Florida Pure Sea Salt Pure Flaked); 2 tablespoons compound butter (Cow's Rule Bleu Cheese & Chive, Au Poivre, or Garlic & Herb)

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Cast iron filet mignon is the whole steakhouse experience pulled indoors and made simple: a hard sear in a screaming-hot skillet, then a quick finish in a 500°F oven that brings the center up to a clean, blushing medium rare. No grill, no fire to manage, no reservation. Just the most tender cut there is, a heavy pan, and a hot oven doing the patient part for you.

Sliced cast iron filet mignon on a wood board with a blushing medium-rare center, melting compound butter, and flaky sea salt

Filet is lean, mild, and cut tall, which makes it the easiest steak to overthink and the easiest to overcook. The fix is order of operations. Sear first for the crust while the skillet is at its hottest, then move the whole pan into the oven where dry, even heat finishes the inside without pushing the outside any further. It is the same logic behind a great blackened filet mignon or a slow sous vide ribeye - control the cook, then finish with confidence. Pour something cold, let the oven work, and you are ten minutes from a plate that looks like it came off a white tablecloth.

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Why You'll Love This Cast Iron Filet Mignon
Cast Iron Filet Mignon Ingredients
Cast Iron Filet Mignon Time & Temp Calculator
How to Make Cast Iron Filet Mignon
Butter or Oil? How to Baste a Filet
Substitutions
Variations
Equipment
Storage
Top Tip - Pull It Early
More Steak Dinners to Try
More Beef & Steak Recipes
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Why You'll Love This Cast Iron Filet Mignon

The steakhouse method, made foolproof - sear for the crust, oven for the cook.
No grill required. A fully indoor cook, ideal for a condo, a rental kitchen, or a quiet night in.
Fast. From cold skillet to rested steak is about 30 minutes, most of it hands-off.
Flaky sea salt and a melting medallion of compound butter turn a simple seared filet into an occasion.
The thermometer takes out the guesswork. Dial in your thickness and doneness below and pull at the exact number.

Cast Iron Filet Mignon Ingredients

You only need a handful of things, and the quality of each one shows. See the recipe card below for exact quantities.

Center-cut filet mignon steaks, about 1.5 inches thick
High-smoke-point oil (avocado or grapeseed) for the sear
Unsalted butter, garlic cloves, and fresh thyme or rosemary for the baste
Kosher salt and freshly cracked black pepper
Flaky finishing salt - Florida Pure Sea Salt Pure Flaked
Compound butter to finish - Cow's Rule Bleu Cheese & Chive is the steak-lover's pick

Cast Iron Filet Mignon Time & Temp Calculator

Set your thickness and target doneness and the calculator returns your sear time, oven finish time, the temperature to pull at, and where the steak lands after it rests. The recipe is built around a 1.5-inch center-cut filet at medium rare, but the numbers move with the cut.

Find Your Cook Time

Set thickness and target doneness. The calculator returns your cast iron sear time per side, the finish time in a 500°F oven, the temperature to pull at, and the final internal after the steak rests.

Filet thickness

Target doneness

Cast iron sear / side 1–2 min + edges briefly

Oven at 500°F 4–5 min after the sear

Pull temp 120–125°F internal

Final after rest 130–135°F 5–10 min rest

Why sear first, then finish in the oven

Filet mignon is lean and cut tall, so the danger is a gray band of overcooked meat around a cold center. Build the crust first while the skillet is rocket-hot — one to two minutes a side is all it takes to get that deep brown sear. Then move the whole skillet into a 500°F oven, where dry, all-around heat brings the center up evenly without pushing the crust any further. Pull a few degrees early and let carryover finish the job during the rest. Crust from the iron, even cook from the oven, juicy center from the rest.

A thermometer is the whole game on filet. Filet mignon is expensive and unforgiving — the window between a blushing medium rare and a dry, gray center is only a few minutes in a 500°F oven. Don’t cook by time alone. Slide an instant-read into the side of the steak toward the center and pull at 120–125°F for medium rare. Carryover and the rest do the last ten degrees. Time tells you when to start checking; the thermometer tells you when it’s done.

USDA recommends 145°F internal for whole-cut beef. Medium rare at 130–135°F is a culinary standard. Pregnant, immunocompromised, very young, or elderly diners should cook to 145°F.

How to Make Cast Iron Filet Mignon

Two stages, one skillet. The sear builds the crust; the oven brings the inside up to medium rare. Exact times and temperatures are in the recipe card.

Two center-cut filet mignon steaks patted dry and seasoned with kosher salt and pepper on a board

Temper, dry, and season

Pull the filets out of the fridge 30 to 45 minutes ahead and pat them bone-dry. A dry surface is the difference between a crust and a steam bath. Season generously with kosher salt and pepper on all sides, and set the oven to 500°F so it is fully up to temperature before the sear.

Filet mignon searing in a smoking-hot cast iron skillet with a deep brown crust forming

Sear the crust

Heat the cast iron over high heat until it just begins to smoke. Add a thin film of high-smoke-point oil, lay the filets down, and do not touch them for one to two minutes. Flip and sear the second side, then use tongs to stand them on their edges and brown the sides. You are building color, not cooking the inside.

Baste, if you like

For a steakhouse finish, drop butter, smashed garlic, and a few sprigs of thyme into the pan at the end of the sear. Tilt the skillet and spoon the foaming butter over the filets for the last 30 to 60 seconds. Add the butter late so it does not burn at high heat - or skip it entirely and let a finishing pat of compound butter carry the butter flavor instead.

Cast iron skillet with seared filets going into a 500°F oven, instant-read thermometer nearby

Finish in the 500°F oven

Slide the whole skillet into the 500°F oven. For a 1.5-inch filet, that is about 4 to 5 minutes to a medium-rare pull. Check the internal temperature in the side of a steak and pull at 120 to 125°F. Do not cook to your final number - carryover finishes the last ten degrees.

Rested filet mignon topped with flaky sea salt and a melting medallion of compound butter on a wood board

Rest and finish

Move the filets to a board and rest 5 to 10 minutes - carryover takes them to a final 130 to 135°F for medium rare. Top each with flaky Florida Pure Sea Salt and a medallion of Cow's Rule compound butter, and let it melt over the top before serving.

Butter or Oil? How to Baste a Filet

This is the one real decision, and there is no wrong answer.

Oil only. Sear in avocado or grapeseed oil and leave it there. It runs hotter without scorching, gives you the cleanest, darkest crust, and lets the finishing butter and salt lead. The simplest, most forgiving path.
Butter baste. After the sear, add butter, smashed garlic, and thyme, tilt the pan, and spoon the foaming butter over the steak. The classic steakhouse move - nutty, aromatic, glossy. Add the butter at the end of the sear, not the start, so it does not burn.
The hybrid. Sear in oil for the crust, then add a knob of butter for the last 30 to 60 seconds for the aroma. Best of both, and what we would reach for most nights.

Substitutions

No avocado or grapeseed oil? Any neutral, high-smoke-point oil works - refined canola or light olive oil. Skip extra-virgin and plain butter for the sear; both burn before the skillet is hot enough.
No fresh herbs? Thyme and rosemary are classic, but the baste is good with just garlic. Dried herbs scorch, so leave them out.
No compound butter on hand? A pat of good unsalted butter mashed with a little garlic and parsley gets you most of the way. The Cow's Rule tubs just save you the step.
Different finishing salt? Any flaky sea salt works in a pinch, but the larger, crisp flakes of Florida Pure Sea Salt give you that gentle crunch you want on the first bite.

Variations

Surf-side finish. A spoonful of garlic-herb compound butter melting into a just-rested filet, eaten on the deck after a day on the water - that is the whole brief.
Au poivre. Swap the bleu cheese butter for Cow's Rule Au Poivre, built on beef demi-glace and peppercorns, for a steak-frites-style finish.
Garlic and herb. For a cleaner, brighter finish that lets the filet lead, the Garlic & Herb compound butter is the move.
Compound butter board. Set out two or three Cow's Rule butters and let everyone choose - Bleu Cheese & Chive, Au Poivre, Garlic & Herb. Pass the board around.

Equipment

A short list, picked once and kept forever. The pan and the thermometer do the real work.

A heavy cast iron skillet. The non-negotiable. Cast iron holds and radiates the kind of heat that builds a real crust, and it moves from stovetop to oven without missing a beat.
An instant-read thermometer. The single tool that saves a filet. Pull at a number, not a guess.
Long, sturdy tongs. For the edge sear and for moving the hot skillet with control.
A wood carving board. Somewhere to rest and finish the steak - and to pass around the table.

Storage

Refrigerate leftover filet in an airtight container for up to 3 days. Reheat gently - a hard reheat overcooks a steak that is already at temperature, so warm slices in a low 250°F oven just until heated through, or eat them cold, sliced thin. Cooked filet does not freeze well; freeze the raw steaks instead and thaw fully in the fridge before cooking.

Top Tip - Pull It Early

The most common filet mistake is cooking it to temperature in the pan or oven. Do not. Pull at 120 to 125°F for medium rare and let carryover and a real rest finish the last ten degrees. A filet that comes out of the oven already at 135°F will be past medium rare by the time it hits the plate.

The skillet handles the crust. The oven handles the cook.

How long do you sear filet mignon in cast iron before the oven?

One to two minutes per side over high heat, plus a quick roll onto the edges. You're building a crust, not cooking the inside - the 500°F oven does that part. For a 1.5-inch filet, follow the sear with about 4 to 5 minutes in the oven for a medium-rare pull.

What temperature should I pull filet mignon for medium rare?

Pull at 120 to 125°F. After a 5 to 10 minute rest, carryover brings it to a final 130 to 135°F, which is a true medium rare. Use an instant-read thermometer in the side of the steak toward the center, and use the calculator above to match your thickness.

Can I make cast iron filet mignon without a grill?

Yes - that's the whole point of this method. The crust comes from the cast iron skillet and the even cook comes from the oven, so you never need an outdoor grill. It's an ideal cook for a condo, an apartment, or a beach rental without a grill on the deck.

Should I baste filet mignon with butter?

You can, and it adds a nutty, aromatic richness, but it's optional. If you baste, add the butter, garlic, and herbs at the end of the sear so the butter doesn't burn at high heat. For the cleanest, darkest crust, sear in oil only and let a finishing pat of compound butter carry the butter flavor instead.