Cast Iron Baked Pork Tenderloin

Enjoy a juicy Pork Tenderloin baked in the cast iron pan that transforms weeknight dinners into a restaurant style meals. This recipe delivers tender, succulent pork with every bite, featuring a savory-sweet blend of Dijon mustard, garlic and herbs-no marinade or searing required for maximum flavor and easy prep.

If you enjoy pork tenderloins as much as I do, you might also like Pork Tenderloin with Chimichurri Sauce and Pork Tenderloin with Pineapple Salsa.

Pork tenderloin is one of the leanest, most tender cuts you can buy. It's naturally mild, which means it happily takes on big, bold flavors with spice rubs, marinades, or simple pan sauces. And best of all? It cooks shockingly fast in a cast iron skillet-in about 30 minutes-making it weeknight-friendly.

Easy Pork Tenderloin Recipe

This might be the easiest and tastiest meal that will ever grace your kitchen table. There's no major preparation involved - just season the mustard covered tenderloin with the garlic and herb spice rub and into the oven it goes. This one is really a winner of your pork dinner menu!

Why You Will Love This Recipe

• Easy: Pork tenderloin is the easiest cut of pork to work with whatever flavors or methods of cooking you choose.
• Taste Explosion: This juicy pork tenderloin is coated in a flavorful Dijon mustard garlic & herb mixture for the ultimate taste explosion. Serve it with the delicious Creamy Garlic Potatoes or Lemon Garlic Green Beans in a Skillet.
• Low carb: This melt in your mouth roasted pork tenderloin is only 1 gram of carbs per serving. It will provide you with nice and steady supply of energy.

Pork Tenderloin Ingredients

• Pork tenderloin: Pork tenderloin is a lean, soft cut of meat that cooks quickly but stays juicy and tender when cooked right. It's also mild in flavor, which means it soaks up whatever delicious things you put on it.
• Dijon Mustard: Think of Dijon mustard as flavor glue (I used Dijon Mustard for the same reason in my Brown Sugar Roasted Pork Loin). It's a bit spicy (but not hot!) and helps the herbs and garlic stick to your pork. It brings a punch of flavor, keeps the meat moist, and forms a tasty crust as it roasts.
• Fresh Garlic: When you chop it up and use it fresh, it spreads that classic, mouthwatering smell and taste all through your pork. The more, the better! Garlic also mingles well with mustard and herbs, so everything tastes balanced and savory.
• Herb Mixture (Italian Seasoning): This is a mix of dried herbs like thyme, oregano, and rosemary. Herbs wake up the taste of the pork - that's it! If you've got a pre-mixed Italian blend, perfect! If not, use what you love.
• Olive Oil: Olive oil helps the herbs and garlic blend together. It coats the pork so the crust stays moist instead of drying out. Plus, it helps everything brown nicely in the oven. I always use extra virgin olive oil, but regular olive oil or avocado oil would do just as well.
• Salt & Pepper: They bring out the flavor in the pork and help any meat taste like more than just, well, plain meat. Pepper adds a gentle bite and a subtle sparkle of flavor. Together, these two make everything else pop.
• Salt & pepper: You will season to your liking.

How to Bake Pork Tenderloin in Cast Iron Pan

This is an overview with step-by-step photos. Full ingredients, measurements & instructions are in the recipe card below.

1. Season the Pork

Sprinkle the pork tenderloin all over with salt and pepper. This is your base layer of flavor.

2. Add the Mustard

Use a pastry brush or spoon to cover the entire surface of the pork tenderloin with Dijon mustard. This helps the flavor stick and keeps the meat moist.

3. Make the Herb Paste

In a small dish, mix together olive oil, chopped fresh garlic, Italian seasoning (or your favorite herbs), and a bit of salt. Stir until it looks like a chunky paste.

4. Coat with Herb Paste

Brush the herb paste on all sides (except the bottom) of the pork tenderloin so it's fully covered.

5. Bake the Pork Tenderloin

Place the coated pork in a cast iron skillet, Dutch oven, or baking sheet. Bake at 350 F. for about 30 minutes, or until a meat thermometer reads at least 145°F in the thickest part.

Let the pork rest for a few minutes, then slice and serve.

Expert Tips For Unbeatable Results

• Coat in Mustard and Oil: For even juicier pork, brush the tenderloin Garlic Herb Oil Rub(with a touch of Dijon Mustard) for 20 minutes before cooking.
• Make sure your cast iron skillet is well seasoned. Here's a comprehensive guide on How To Season Cast Iron Skillet.
• To Prep the Tenderloin: Using a pastry brush, cover the tenderloin with the herb paste. All around. Make sure to cover the tenderloin on top and all sides, except the bottom.
• Don't Overbake: Use an instant-read thermometer; remove pork at exactly 145°F for the juiciest texture.
• Make-Ahead: Pork tenderloin keeps well, so meal prep extra for lunches or quick dinners all week.
• Resting is key: Letting the meat rest after baking allows juices to redistribute for maximum tenderness.

Why Is My Pork Tenderloin Dry or Tough?

Pork tenderloin is often dry or tough due to overcooking or insufficient resting time. To fix and prevent dryness or toughness, ensure you cook it to the proper internal temperature, let it rest before slicing, and use moist cooking methods (hello Dijon Mustard!) or marinades when possible.

• Fix: Always use a meat thermometer-pull the pork out of the oven when the internal temp reaches 145°F, then rest 5-10 minutes before slicing. Overcooked pork loses its moisture quickly.
• Pro Tip: Tent with foil during resting so it stays warm and continues evenly cooking inside.

How to Fix Undercooked Pork Tenderloin

If your pork tenderloin is undercooked, you can safely finish cooking it without drying it out by using gentle, even heat and checking the temperature early enough and frequently.

• Return to Oven: Place the pork back in the oven at a moderate temperature (300-350°F), covering it loosely with foil to keep it moist. This allows the inside to finish cooking without over-browning or drying out the exterior.
• Slice for Even Cooking: If the tenderloin is thick and very undercooked, slice it into medallions or thick pieces. Lay them in a baking dish, add a splash of broth or pan juices, cover with foil, and return to the oven. Slicing helps the pork cook through more quickly and evenly, preventing the outside from getting tough.
• Let It Rest: Allow the pork to rest, tented with foil, for 3-5 minutes after baking. This ensures carryover cooking and retains juices.

Best Resting Time for Juicy Pork Tenderloin

The best resting time for juicy pork tenderloin is always 5-10 minutes after removing it from the oven, lightly covered with foil to keep in heat and moisture. This rest period lets the juices redistribute throughout the meat, preventing them from spilling out when you slice into it and ensuring every bite is juicy and tender.

For extra-thick or large pork tenderloins, you can rest it for up to 15 minutes if needed, but there's rarely a benefit to resting much longer because pork tenderloin is a lean, small cut and can cool quickly.

Pro Tip: Always tent loosely-do not wrap tightly-or you may steam the crust and lose texture.

Can You Use Pork Loin Instead of Tenderloin?

Yes, but pork loin is larger and needs a longer bake time (start checking doneness at 145°F but allow 45-60 minutes if whole).

FAQs

Can You Bake Pork Tenderloin Ahead of Time? Yes! Cooked pork tenderloin keeps in the fridge for up to five days-or freeze up to six months. Slice before freezing for faster reheating.

How Do You Keep Pork Tenderloin Moist? Coat it in the delicious
Dijon Mustard pasta and bake at a right heat level, rest the meat after baking, and always use a thermometer-pull it out at 145°F.

What's a Quick Substitute for Olive Oil? Canola, avocado, or melted butter all work. Even cooking spray can be used in a pinch-just make sure the outside is lightly coated so spices stick.

Is It Okay if Pork Is Pink Inside? Yes, as long as the inside temp is at least 145°F, a little pink is perfectly safe and recommended for the juiciest texture.

Essential Equipment

• Cast iron pan or dutch oven: Both conduct heat very well and ensure even cooking that preserves moisture. I used a cast iron skillet and couldn't be happier.
• Instant Read Thermometer: Digital Meat Thermometer, but if you are really want to be a bit more scientific with your cooking, then use this professional meat thermometer.
• Baking sheet: You can also use a baking dish or a baking sheet, although the results may vary.

How to Buy the Best Pork Tenderloin

When shopping for pork tenderloin, always choose a fresh, unseasoned cut instead of those pre-marinated options at the store. Buying plain pork lets you control the salt, flavorings, and overall quality-ensuring the final dish is juicy, perfectly seasoned, and never too salty.

For this juicy baked pork tenderloin, you'll see just how fast and easy it is to coat your tenderloin with a homemade rub of brown sugar, garlic, and spices for incredible results.

Safe Cooking Temperature for Pork

Use meat thermometer: Always use a meat thermometer to determine whether your pork tenderloin is done. It should register at 145 F. At this point the pork tenderloin will be slightly pink, which is perfectly normal. But you can also cook it until the internal temperature reaches between 145° and 160° F, and it will be slightly more done and white in color at that point.

Is Pork Tenderloin Same As Pork Loin?

Pork tenderloin and pork loin are not the same. Pork tenderloin is a smaller, very lean, and extra tender cut that cooks much faster, while pork loin is larger with more fat and is suited for slow roasting. Due to their differences in size, texture, and cooking time, these cuts are not interchangeable in recipes.

Serving Suggestions

You can't go wrong with classic mashed potatoes, some Honey Roasted Carrots, or even simple Scalloped Potatoes.

Want even more pork? Try creamy Pulled Pork Mac and Cheese, a scoop of Southern Potato Salad, or toss together a fresh Arugula and Spinach Salad for something bright-so good alongside juicy baked pork tenderloin.

Storage and Leftovers

• Refrigerate: Allow baked pork tenderloin to cool to room temperature, then store in an airtight container or wrapped tightly in foil for up to 3-4 days in the refrigerator.
• Freeze: To freeze, wrap slices or the baked pork tenderloin tightly in plastic wrap or foil, then place in a freezer-safe bag or container. Store for up to 2-3 months. Thaw overnight in the refrigerator before reheating.
• Reheating: Reheat it gently in the oven or on the stovetop with a splash of broth or leftover pan sauce to maintain moisture and prevent dryness.

More Pork Tenderloins

• Brown Sugar, Garlic and Herb Tenderloin
• Low Carb Pork Tenderloin
• Brown Sugar Dijon Glazed Pork Loin with Carrots, Apples and Sweet Potatoes