Mississippi pot roast sounds almost too simple to be good. A chuck roast, two seasoning packets, a handful of pepperoncini, a stick of butter, and that is basically it. No browning a dozen vegetables, no fussy sauce, no all-day babysitting. And yet the result is one of the most tender, buttery, tangy roasts you will ever slice into.

The original version simmers in a slow cooker for eight hours. The Instant Pot version gets you the same fall-apart beef in about 90 minutes, and the pressure cooker pushes that flavor even deeper into the meat. The ranch and au jus melt into the cooking liquid, the pepperoncini brine adds a gentle tang, and the butter bastes everything as it cooks.

This is the dinner to make when you want the house to smell incredible without spending your afternoon over the stove. Set it up, let the pot do the work, and come back to a roast that shreds with a fork.

The beauty of this recipe is how forgiving it is. Chuck roast is a tough cut by nature, which is exactly why it turns so beautifully under pressure — the connective tissue breaks down into rich, silky juices instead of drying out.

Why You’ll Love This Recipe

The flavor is the first thing you will notice. Ranch brings a herby, savory warmth, au jus brings deep beefy richness, and the pepperoncini add just enough brightness to cut through the butter. Together they make a gravy you will want to spoon over everything on the plate.

It is also genuinely easy. Five minutes of searing, a few minutes to layer in the seasonings, and the Instant Pot takes it from there. If you love slow-cooked beef dinners like this one, our best corned beef recipe is another comforting classic worth trying.

Ingredients

Everything here is a pantry or fridge staple — the two seasoning packets do most of the flavor work:

3 to 4 lb beef chuck roast
1 tablespoon olive oil
1 packet (1 oz) ranch seasoning mix
1 packet (1 oz) au jus gravy mix
6 to 8 pepperoncini peppers, plus 2 tablespoons of their brine
4 tablespoons (½ stick) unsalted butter, cut into pieces
1 cup beef broth
1 teaspoon garlic powder
½ teaspoon black pepper
Optional: 1 lb baby potatoes and 4 large carrots, cut into chunks, to cook in the pot

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How to Make It

Season the roast: Pat the chuck roast dry and season it all over with the garlic powder and black pepper. The ranch and au jus packets bring plenty of salt, so there is no need to add more.
Sear for flavor: Set the Instant Pot to Sauté on high and add the olive oil. When it shimmers, sear the roast for 3 to 4 minutes per side until deeply browned, then transfer it to a plate.
Deglaze the pot: Pour in the beef broth and scrape the bottom of the pot with a wooden spoon to lift up all the browned bits. That flavor is worth saving, and it also keeps the pot from giving you a burn warning.
Layer the seasonings: Place the roast back in the pot. Sprinkle the ranch and au jus mixes evenly over the top, scatter the pepperoncini around it, and pour in the brine. Lay the butter pieces on top.
Add the vegetables (optional): If you are cooking the potatoes and carrots, nestle them around the roast. They will soak up the cooking liquid and come out tender and richly flavored.
Pressure cook: Lock the lid, set the valve to sealing, and cook on High Pressure for 65 minutes. Let the pressure release naturally for 15 minutes, then quick-release any remaining steam.
Shred and serve: Transfer the roast to a cutting board and shred it with two forks, or slice it thickly. Spoon the cooking liquid over the meat and serve with the vegetables and gravy from the pot.

Cooking Tips / Variations

Chuck roast is the cut to use here — its fat and connective tissue turn silky under pressure. A leaner cut like sirloin or round will come out dry no matter how carefully you cook it, so stick with chuck.

Do not skip the sear. It only takes a few minutes and builds a layer of deep, roasty flavor that seasoning alone cannot give you. And do not worry about the butter — it melts into the cooking liquid and turns it into a rich, glossy gravy.

If you like a little more tang, add a few extra pepperoncini or a spoonful of the brine. The peppers are mild rather than spicy, so the dish stays family-friendly. For another beef main that is just as satisfying on a busy night, our tender steak recipe comes together fast and never disappoints.

Serving or Storage Tips

Serve the roast over mashed potatoes, egg noodles, or rice, with plenty of the pot gravy spooned over the top. The potatoes and carrots from the pot make a complete one-pot meal on their own, and a simple green salad on the side keeps the plate balanced.

Leftovers keep beautifully in the fridge for up to 4 days — store the meat in its cooking liquid so it stays moist. Reheat gently with a splash of the gravy. The roast also freezes well for up to 3 months; thaw overnight in the fridge and reheat in its juices.

Conclusion

One pot, a handful of ingredients, and about 90 minutes stand between you and a Mississippi pot roast that is buttery, tangy, and fall-apart tender.

Set it up, let the pressure cooker work, and enjoy a dinner that tastes like it took all day.