This pot roast basically cooks itself—and the tender, juicy flavor is unreal. Making Slow Cooker Mississippi Roast is as easy as it gets for melt-in-your-mouth comfort. 1️⃣ Spray your slow cooker for easy cleanup, then place a 3–5 lb beef chuck roast inside. 2️⃣ Sprinkle over 1 packet each of onion soup mix and ranch dressing mix. 3️⃣ Top with ½ cup butter (cut into pieces), ½ cup pepperoncini peppers, and ¼ cup of the pepper juice. 4️⃣ Cover and cook: 8–10 hrs on low or 5–6 hrs on high, then sh