Creating Slow Cooker Salisbury Steaks is a breeze if you follow these simple steps:

1. Prepare the Beef Patties: In a large bowl, mix the ground beef, chopped onion, garlic powder, onion powder, salt, pepper, and Worcestershire sauce until well combined. Form the mixture into 4-6 equal patties.
2. Brown the Patties: In a skillet over medium heat, brown the patties for about 3-4 minutes on each side. This step adds flavor but is optional if you’re short on time.
3. Add to Slow Cooker: Place the browned patties in the slow cooker. If you skipped browning, just place the raw patties directly.
4. Mix the Gravy: In a separate bowl, combine beef broth, onion soup mix, and flour. Whisk until smooth, then pour the mixture over the patties in the slow cooker.
5. Add Mushrooms: If using, sprinkle the sliced mushrooms over the patties.
6. Cook: Cover the slow cooker and cook on low for 6-8 hours or on high for 3-4 hours, until the patties are cooked through and tender.
7. Add Creaminess: If desired, stir in heavy cream or sour cream during the last 30 minutes of cooking to make the gravy richer.
8. Serve: Once cooked, serve the Salisbury steaks topped with the gravy over your choice of mashed potatoes, rice, or egg noodles.

Following these steps will ensure that your Slow Cooker Salisbury Steaks are flavorful and satisfying!