Mississippi Pot Roast Recipe Instant Pot: Butter-Braised Beef with Pepperoncini Punch

This Instant Pot version brings all the rich, buttery flavor of traditional Mississippi pot roast to your table in a fraction of the time. The secret lies in the combination of ranch seasoning, au jus mix, and pepperoncini that create an irresistible depth of flavor.

What makes this recipe special is its ability to transform tough cuts of beef into tender, fall-apart meat without hours of slow cooking. The pressure cooker locks in moisture while infusing the beef with the bold, tangy taste that defines this Southern classic.

You’ll end up with a savory pot roast that’s perfectly seasoned, with a buttery sauce that’s begging to be soaked up with crusty bread or mashed potatoes. The pepperoncini add just the right amount of tangy kick to balance the richness.

This dish delivers restaurant-quality results with minimal hands-on time, making it perfect for busy weeknights when you crave comfort food without the long wait.

Ingredients for Mississippi Pot Roast Recipe Instant Pot

Rich, buttery comfort food with a tangy kick. Pantry staples meet pressure cooker magic.

The beef is the foundation here. Chuck roast is ideal for its marbling and connective tissue that breaks down beautifully under pressure. Look for well-marbled pieces at Costco or your butcher—avoid lean cuts like sirloin, which dry out. The ranch and au jus mixes are non-negotiable for authentic flavor; Hidden Valley and Lawry’s are reliable brands. Don’t skip the butter—it’s what makes the sauce irresistibly rich.

No ranch mix? Homemade blend of dried dill, parsley, garlic powder, and onion powder at one-third the amount works. Out of au jus? Beef bouillon cube dissolved in water (use half the liquid). Pepperoncini can be swapped for banana peppers (milder) or jalapeños (spicier). The broth can be water in a pinch, but the depth of flavor suffers. Always use unsalted butter so you can control the seasoning.

Leftovers taste even better the next day. Store in an airtight container for up to 4 days in the fridge or freeze for 3 months. The sauce thickens as it cools—reheat with a splash of broth to loosen. Perfect for meal prep; just shred the beef before storing for easy reheating.

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

Here’s my tested method for tender, flavor-packed beef with minimal hands-on time.

Step 1: Sear and Season the Chuck Roast

Pat the 3 lb chuck roast dry with paper towels, then season all over with the 1 tsp kosher salt and 0.5 tsp black pepper. I like to let it sit for 5 minutes to allow the seasoning to adhere to the meat.

Set your Instant Pot to “Sauté” on medium-high heat. Add 1 tbsp of the 0.5 cup unsalted butter and let it melt. Sear the chuck roast on all sides for 3-4 minutes per side until it develops a deep brown crust. This step builds incredible flavor and ensures the meat doesn’t stick during pressure cooking.

Step 2: Layer the Aromatics and Seasonings

Remove the seared roast and set it aside. In the same pot, add the 1 whole yellow onion (quartered), 4 cloves garlic cloves (smashed), and the remaining 0.5 cup unsalted butter (cut into pats). Let the butter melt and the onions soften slightly for 2 minutes.

Sprinkle the 1 package ranch seasoning mix and 1 package au jus mix over the onions and butter. Pour in the 0.5 cup beef broth and use a wooden spoon to scrape up any browned bits from the bottom of the pot. This deglazing step prevents burning and infuses the liquid with rich flavor.

Step 3: Pressure Cook to Tender Perfection

Return the chuck roast to the pot, placing it on top of the onions. Add the 0.5 cup pepperoncini peppers (including 2 tbsp juice), scattering them around the meat. Secure the lid and set the Instant Pot to high pressure for 60 minutes.

Once the cooking time is complete, allow the pressure to release naturally for 15 minutes, then quick-release any remaining pressure. The meat should be fork-tender and falling apart at the touch. If it’s not quite there, seal the lid and cook for an additional 10 minutes on high pressure.

Step 4: Thicken the Sauce and Finish

Remove the chuck roast and set it on a cutting board. In a small bowl, whisk the 2 tbsp all-purpose flour with ¼ cup of the cooking liquid to create a smooth slurry. Stir the slurry into the remaining liquid in the Instant Pot.

Set the Instant Pot back to “Sauté” on medium heat and let the sauce simmer for 3-5 minutes until it thickens to your desired consistency. Taste and adjust seasoning if needed. Slice or shred the roast, then return it to the pot to coat in the rich, buttery sauce. Garnish with 1 tsp dried thyme if desired before serving.

Essential Equipment for This Recipe

Instant Pot Essentials

You can’t make this dish without a quality 6-quart Instant Pot—I use the Duo Crisp model for its versatility. The pressure cooker function is non-negotiable for achieving that fall-apart tenderness in 60 minutes. 🔥

Wooden Spoon

A sturdy wooden spoon is crucial for deglazing the pot after searing. I prefer bamboo because it won’t scratch your Instant Pot’s non-stick surface. Use it to scrape up all those flavorful browned bits when adding the broth.

Meat Thermometer

While not strictly necessary, I always use my ThermoWorks Instant Read to verify the roast reaches 203°F internal temperature for perfect doneness. This ensures the collagen has fully broken down, even if your Instant Pot’s timer goes off early.

Slurry Tools

For thickening the sauce, you’ll need a small whisk and measuring cups. I use a ¼ cup measure for the cooking liquid when making the slurry. A liquid measuring cup with a spout makes pouring easier.

Serving Equipment

Have a cutting board and sharp carving knife ready for slicing the roast. I like my Wüsthof 8-inch chef’s knife for clean cuts. Don’t forget a ladle for serving that incredible buttery sauce over mashed potatoes. 💛

Frequently Asked Questions