Mississippi Pot Roast Recipe Instant Pot: Fork-Tender Beef With Pepperoncini Punch

This Instant Pot version of the classic delivers fork-tender beef in a fraction of the time. The secret is in the pepperoncini and ranch seasoning blend.

I’ve adapted this recipe to capture all the rich, savory flavors of the original while making it weeknight-friendly. The result is melt-in-your-mouth beef with a tangy, aromatic sauce.

Ingredients for Mississippi Pot Roast Recipe Instant Pot

Simple ingredients, one pot, and that signature pepperoncini tang you crave.

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The chuck roast is non-negotiable here—look for good marbling at the store, which means more fat = more flavor (trust me, it’s worth it). Costco has great pre-cut chunks, but any grocery store butcher can trim and cube it for you. Pepperoncinis are usually by the pickles—Mezzetta is my go-to brand. Don’t skip the juice, it’s where the magic happens.

No ranch packets? Make your own with dried dill, parsley, garlic powder, and onion powder. Au jus is trickier to sub, but beef bouillon plus a pinch of soy sauce gets close. Out of pepperoncinis? Banana peppers work in a pinch. The butter can be swapped for olive oil, but you’ll lose some richness (the good stuff is worth it).

Leftovers taste even better the next day. Store in the fridge for up to 4 days or freeze for 3 months. The sauce thickens as it cools—just stir in a splash of broth when reheating.

Step-by-Step Instructions for Mississippi Pot Roast Instant Pot

Here’s the method that turns tough chuck into fall-apart tender beef in record time.

Step 1: Sear and Season the Chuck Roast

Cut the 3 lb chuck roast into 3-4 large chunks so they fit comfortably in your Instant Pot. Set the pot to Sauté mode and sear the chunks on all sides until deeply browned—about 3-4 minutes per side. This builds a flavor base that’s non-negotiable.

While searing, sprinkle the meat with 1 tsp kosher salt and 1 tsp black pepper. Don’t skip this step—the caramelized bits left in the pot will dissolve into the cooking liquid, creating layers of rich, meaty depth.

Step 2: Build the Flavor Foundation

Once the chuck roast is browned, remove it and set aside. In the same pot, add the 1 whole yellow onion (quartered), 4 cloves garlic cloves (smashed), 0.5 cup pepperoncini peppers, 1 package ranch seasoning mix, and 1 package au jus seasoning mix. Stir for 1 minute to toast the spices lightly.

Pour in the 1 cup beef broth and 2 tbsp Worcestershire sauce, then scrape the bottom of the pot to release all those browned bits. This deglazing step ensures nothing sticks and burns during pressure cooking, which can trigger the Instant Pot’s burn notice.

Step 3: Add Remaining Ingredients and Pressure Cook

Return the chuck roast to the pot. Add the 0.5 cup unsalted butter (cut into cubes), 1 tsp dried thyme, 1 tsp dried rosemary, and 1 whole bay leaf. Secure the lid, set the valve to Sealing, and cook on High Pressure for 60 minutes.

The pot will take about 10-15 minutes to come to pressure, then the cooking begins. Resist the urge to peek—the steam release is part of the process. When the timer ends, let the pressure release naturally for 15 minutes before switching the valve to Venting to finish the release.

Step 4: Shred and Serve

Remove the lid and discard the bay leaf. The chuck roast should be fork-tender—easily pulling apart with minimal effort. Use two forks to shred the beef directly in the pot, stirring it into the juices so every bite soaks up that pepperoncini-infused liquid.

Let the roast sit in the pot for 5-10 minutes to absorb more flavor before serving. The butter will have melted into the sauce, creating a rich, velvety texture that clings to the meat. Serve hot, with extra pepperoncini peppers on the side if you want an extra tangy kick.

Health Benefits of This Dish

Protein Powerhouse

The chuck roast in this dish packs a serious protein punch—about 45 grams per serving. This supports muscle maintenance and keeps you feeling full and energized. As a pitmaster, I appreciate how beef’s natural richness satisfies without needing fancy ingredients. 💪

Rich in Iron

Beef is one of the best sources of heme iron, which your body absorbs more easily than plant-based iron. A single serving provides about 20% of your daily iron needs, helping prevent fatigue and supporting red blood cell production.

Vitamin B Boost

This dish is loaded with B vitamins, especially B12 and B6, which are crucial for energy metabolism and brain function. The ranch seasoning adds extra herbs that contribute to your daily vitamin intake.

Healthy Fats Included

While we watch our fat intake, the unsalted butter and marbled chuck roast provide healthy fats that help your body absorb fat-soluble vitamins. These fats also contribute to the dish’s satisfying, rich mouthfeel.

Low-Carb Friendly

With no added sugars or carbs, this recipe fits perfectly into low-carb or keto diets. The pepperoncini add flavor without significant carbs—just about 3 grams per serving from the vegetables.

I love that this meal delivers comfort food satisfaction while still aligning with healthier eating goals. 🥗

Frequently Asked Questions