Transfer beef and onions to slow cooker and add mushrooms, garlic powder, onion powder, dried thyme, rosemary, bouillon cube, Worcestershire sauce, bay leaf, pepperoncinis, and 2 cups beef stock. Cover and cook on high for 3-4 hours or low for 6-7 hours.
30 minutes before cooking time is over, whisk cornstarch into 3 tablespoons water and add to slow cooker. Cover and continue cooking for remaining 30 minutes. Season to taste and enjoy!
TO MAKE IN THE INSTANT POT:
Add beef back to Instant Pot (with onions) and add mushrooms, garlic powder, onion powder, dried thyme, rosemary, bouillon cube, Worcestershire sauce, bay leaf, pepperoncinis, and 1 1/2 cups beef stock.
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