Instant Pot Mississippi Pot Roast

Name: Instant Pot Mississippi Pot Roast
Prep time: 30 min
Cook time: 1 h 10 min
Total time: 1 h 40 min
Cuisine: American
Ingredients: 5 lbs chuck roast (cut into 2 chunks that would fit in the pot); 3 tablespoons vegetable (or canola oil); 1 small onion (diced); 1 tablespoon minced garlic; 1/2 cup water; 1/2 cup pepperoncini juice (from the jar); 3/4 cup beef broth (low sodium); 1 tablespoon Worcestershire sauce; 1/2 teaspoon salt; 1/2 teaspoon ground black pepper; 1/4 teaspoon red pepper flakes; 1 packet of dry Ranch Dressing Mix; 1 packet of Au Jus Mix; 12 Pepperoncinis (whole); 1 stick unsalted butter (sliced); 8 cloves garlic (whole); 5 bay leaves; 2-3 tablespoons cornstarch; 3 tablespoons water