Prepare the steak

• Cut the sirloin steak into bite-sized cubes.
• Place the steak bites in the slow cooker.

Add the seasonings and butter

• Sprinkle the au jus gravy mix and onion soup mix over the steak.
• Scatter the sliced butter on top.

Pour in the broth

• Pour the beef broth over everything without stirring.

Cook low and slow

• Cover and cook on low until the steak is tender.
• Stir once or twice near the end of cooking.

Serve

• Spoon the steak bites and gravy over mashed potatoes, rice or noodles.