I make this Instant Pot Mississippi Pot Roast on busy nights when I want comfort without fuss. It gives deep, beefy flavor with a bright, tangy lift from the pepperoncini. The roast comes out shreddable and saucy, perfect spooned over mashed potatoes or tucked into crusty rolls.

What I love most is how hands-off the slow-supper vibe becomes when you use pressure. There’s a short searing step, a quick deglaze, and then the Instant Pot does the rest with steady, reliable heat. Finish with a simple cornstarch slurry and you have rich gravy in minutes.

This post walks you through the ingredients, every step as written for the Instant Pot, and pragmatic tips I use to avoid common mistakes. Read the recipe through once, gather the few tools and pantry items it asks for, and you’ll be set for a cozy, crowd-pleasing dinner.

Ingredient Checklist

2 tablespoons vegetable oil or olive oil — for searing the beef; helps develop a brown crust and fond.
4 pound chuck roast trimmed of excess fat and cut into 6 pieces — the main protein; cutting into pieces brings it to pressure-cooked tenderness faster.
8-10 jarred pepperoncini peppers plus ¼ cup liquid from jar — gives brightness and a subtle vinegar tang; reserve the liquid for deglazing.
¾ cup beef broth low sodium — supplies the liquid needed for pressure cooking and adds beefy depth without oversalting.
1 1-ounce ranch seasoning packet — adds savory, herby backbone; it’s key to the classic Mississippi flavor.
1 1-ounce dry onion soup mix packet — contributes umami and onion-forward savory notes.
2 tablespoons butter — dotted on top for richness and a silky finish.
2 tablespoons cornstarch — thickener for the cooking liquid to make a glossy gravy.
2 tablespoons water — used to form a smooth cornstarch slurry.

Instant Pot Mississippi Pot Roast Made Stepwise

Select SAUTE on the Instant Pot and heat the oil until shimmering.
Add the chuck roast pieces in a single layer and sear on all sides until browned, working in batches if needed so pieces do not overcrowd the pot. Remove the browned beef to a plate and set aside.
Pour the 1/4 cup liquid from the pepperoncini jar and the 3/4 cup beef broth into the pot. Scrape the bottom to deglaze and loosen any browned bits.
Return the beef to the pot. Sprinkle the ranch seasoning packet and the dry onion soup mix packet evenly over the beef. Add the 8–10 pepperoncini peppers. Gently stir to distribute the seasonings and peppers.
Cut the butter into 2–3 pieces and arrange the pieces over the beef.
Secure the lid and set the vent to SEALING. Select PRESSURE COOK/MANUAL on high pressure and set the time for 60 minutes. (The Instant Pot will take about 7–8 minutes to come to pressure.)
When the cooking program finishes, let the pressure release naturally for 15 minutes, then carefully move the vent to VENTING to release any remaining steam. When the float valve drops, remove the lid.
Carefully transfer the beef to a plate or cutting board and shred with two forks.
In a small bowl, whisk the cornstarch and water together until smooth to make a slurry. Select SAUTE on the Instant Pot and stir the slurry into the cooking liquid. Cook, stirring, until the sauce thickens (about 1–2 minutes).
Return the shredded beef to the pot and stir to coat it in the thickened sauce.
Serve the Mississippi pot roast with mashed potatoes and extra sauce as desired.

What Sets This Recipe Apart

This dish contrasts rich, slow-braised beef with a punchy acidic note from the pepperoncini. That balance is what makes it addictive: beefy fat meets bright vinegar. The ranch and onion soup packets bring a layered, almost creamy-herby profile without needing dozens of spices.

The Instant Pot compresses hours of braising into about an hour under pressure. You still get tender, shreddable meat and deep flavor, but without the all-day stow-and-wait. That makes it ideal for weeknights when you want comfort food on a schedule.

Flavor-Forward Alternatives

If you want to nudge the flavor profile, try one of these options. Each change keeps the core idea intact but shifts the final character.

Smokier: Add 1–2 teaspoons smoked paprika with the ranch packet. It deepens the aroma without overpowering the pepperoncini tang.
Spicier: Include 1–2 sliced jalapeños or 1/2 teaspoon crushed red pepper flakes with the pepperoncini for heat. Reduce if serving kids.
Herbaceous: Toss in a few sprigs of fresh thyme or a bay leaf when you pressure cook; remove before shredding.
Beef-forward: Replace low-sodium beef broth with a strong homemade beef stock for a meaty, gelatinous sauce.
Butter switch: Use brown butter for the finishing dots to add nutty complexity.

Kitchen Gear Checklist

Instant Pot or electric pressure cooker — required for the timing and pressure method in this recipe.
Long tongs or spatula — for handling and searing the roast pieces safely.
Sharp knife and cutting board — to trim and cut the roast into six pieces before searing.
Small bowl and whisk or fork — to make the cornstarch slurry lump-free.
Two forks or meat claws — for shredding the cooled beef.
Heatproof spoon or silicone spatula — for scraping the bottom and stirring the slurry into the cooking liquid.

Pitfalls & How to Prevent Them

Here are the common missteps and the exact things I do to avoid them.

Overcrowding during sear: If you pile the roast pieces together, they steam instead of brown. Work in batches so each piece has contact with the hot pot.
Burn notice or stuck fond: Always deglaze thoroughly after searing. Pour the pepperoncini liquid and beef broth in, then scrape the bottom with a wooden spoon until bits loosen. That prevents the Instant Pot from misreading burnt residue.
Undercooked or dry meat: Follow the 60-minute pressure cook time for 4 pounds of chuck cut into 6 pieces. Natural release for 15 minutes helps keep the meat juicy.
Lumpy gravy: Mix cornstarch with cold water to a smooth slurry before adding. Whisk it and add while on SAUTE, stirring until the sauce thickens.
Too salty: Use low-sodium beef broth and taste the sauce after thickening. You can always salt later but you can’t remove excess salt once added.

Variations by Season

Small swaps make this roast feel right for different times of the year.

Winter: Serve over creamy mashed potatoes with roasted root vegetables and a sprinkle of flaky sea salt on top. Add extra butter for richness.
Spring: Brighten with fresh chopped parsley or thinly sliced radishes on top to cut the richness.
Summer: Shred and pile into soft rolls with coleslaw for a BBQ-style sandwich that’s lighter and portable.
Fall: Serve with buttery egg noodles and sautéed mushrooms for a hearty, earthy meal.

Behind-the-Scenes Notes

Chuck roast is an economical cut with connective tissue that melts under long, moist heat. The pressure cooker accelerates that breakdown, giving the same collagen conversion you’d get from slow braising. Cutting the roast into six pieces simply shortens the time it takes for the center of each piece to reach doneness under pressure.

The ranch and onion soup packets are modern conveniences—they concentrate a number of seasonings and aromatics into a single-use packet, saving time and balancing the sauce. The pepperoncini jar does double duty: the peppers add flavor, while the brine provides vinegar and salt for deglazing. Keep a jar of good pepperoncini in your pantry if you cook this often.

How to Store & Reheat

Store leftover roast and sauce together in an airtight container in the refrigerator for up to 4 days. You can also freeze portions for up to 3 months. Cool the food to room temperature before sealing and refrigerating or freezing.

To reheat:

Stovetop: Warm gently in a skillet over medium-low heat with a splash of beef broth or water to loosen the sauce. Stir until heated through.
Microwave: Place in a microwave-safe dish, cover loosely, and heat in 60–90 second increments, stirring between blasts to ensure even warming.
Oven: For larger batches, heat at 325°F covered with foil until warmed through, roughly 20–30 minutes depending on portion size.

Reader Questions

Q: Can I skip searing to save time?

A: You can, but you’ll lose the deep browned flavor and fond that build the sauce’s complexity. Searing adds 10–15 minutes and pays off in taste.

Q: Can I use a whole roast instead of cutting into pieces?

A: Yes, but you’ll likely need to increase pressure time. The recipe as written expects six pieces. If you leave it whole, plan for a longer cook and ensure the roast fits comfortably in the pot without touching the lid.

Q: Are pepperoncini necessary?

A: The pepperoncini (and their liquid) are key to the signature bright tang. You could substitute a small splash of vinegar and a mild pepper, but the classic profile will change.

Q: Can I double the recipe?

A: You can increase the quantity if your Instant Pot has capacity, but do not overfill beyond the manufacturer’s max fill line. You may need to cook in two batches for best browning and heat distribution.

Let’s Eat

Serve the shredded Instant Pot Mississippi Pot Roast spooned over generous mashed potatoes or buttered egg noodles. Ladle extra sauce on top and add a few of the cooked pepperoncini for contrast. A simple green salad or quick steamed greens brighten the plate and cut the richness.

Leftovers make fantastic sandwiches. Pile the shredded beef on soft rolls, add a spoonful of extra sauce, and top with crunchy slaw for texture. This is the kind of recipe that rewards small rituals: the perfect bowl, a pat of butter, and a fork ready to pull the meat into tender ribbons.

Make it tonight when you want comfort that’s mostly set-it-and-forget-it, but still tastes like you spent the afternoon tending a pot. It’s reliable, flavorful, and always asks for seconds.

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Instant Pot Mississippi Pot Roast

Tender chuck roast cooked in the Instant Pot with pepperoncini, ranch seasoning, and onion soup mix, finished with a thickened sauce.

Prep Time10

Cook Time1 30

Total Time1 40

Course: Main Course

Cuisine: American

Servings: 8 servings

Ingredients

?2 tablespoonsvegetable oilor olive oil
?4 poundchuck roasttrimmed of excess fat and cut into 6 pieces
?8-10 jarred pepperoncini peppersplus 1/4 cup liquid from jar
?3/4 cupbeef brothlow sodium
?1 1-ounceranch seasoning packet
?1 1-ouncedry onion soup mix packet
?2 tablespoonsbutter
?2 tablespoonscornstarch
?2 tablespoonswater

Instructions

Select SAUTE on the Instant Pot and heat the oil until shimmering.
Add the chuck roast pieces in a single layer and sear on all sides until browned, working in batches if needed so pieces do not overcrowd the pot. Remove the browned beef to a plate and set aside.
Pour the 1/4 cup liquid from the pepperoncini jar and the 3/4 cup beef broth into the pot. Scrape the bottom to deglaze and loosen any browned bits.
Return the beef to the pot. Sprinkle the ranch seasoning packet and the dry onion soup mix packet evenly over the beef. Add the 8–10 pepperoncini peppers. Gently stir to distribute the seasonings and peppers.
Cut the butter into 2–3 pieces and arrange the pieces over the beef.
Secure the lid and set the vent to SEALING. Select PRESSURE COOK/MANUAL on high pressure and set the time for 60 minutes. (The Instant Pot will take about 7–8 minutes to come to pressure.)
When the cooking program finishes, let the pressure release naturally for 15 minutes, then carefully move the vent to VENTING to release any remaining steam. When the float valve drops, remove the lid.
Carefully transfer the beef to a plate or cutting board and shred with two forks.
In a small bowl, whisk the cornstarch and water together until smooth to make a slurry. Select SAUTE on the Instant Pot and stir the slurry into the cooking liquid. Cook, stirring, until the sauce thickens (about 1–2 minutes).
Return the shredded beef to the pot and stir to coat it in the thickened sauce.
Serve the Mississippi pot roast with mashed potatoes and extra sauce as desired.

Equipment

Instant Pot

Notes

Notes:
Use a packet of ranch, or two tablespoons of
homemade ranch seasoning
.