Pressure Cook Pot Roast:
Stir in 1 tsp (2.4g) onion powder, 1 tsp (2.8g) garlic powder, 1 tsp dried dill weed, 1 tsp dried parsley flakes, and 1 tsp dried or fresh chives. Mix well.
Partially submerge chuck roast steak and 3 - 5 (45g - 70g) pepperoncini peppers in the cooking liquid. Pour in the meat juice. Layer ¼ cup (63g) unsalted butter on top of the chuck roast steak. Close lid and pressure cook at High Pressure for 45 minutes + Full Natural Release (~roughly 20 minutes). Open the lid carefully. Set aside the Mississippi roast on a serving plate.