Step 1: Prepare the Beef Patties
In a large bowl, mix the ground beef, egg, breadcrumbs, garlic powder, onion powder, Worcestershire sauce, salt, and pepper. Form the mixture into thick oval patties.
Step 2: Brown the Patties
Heat a skillet over medium heat. Brown the patties for about 2 minutes per side. They do not need to cook fully at this stage.
Step 3: Add Ingredients to Slow Cooker
Place the chopped potatoes and diced onions into the bottom of the slow cooker. Arrange the browned patties on top.
Step 4: Make the Gravy
In a bowl, whisk together the beef broth, brown gravy mix, and cream of mushroom soup until smooth. Pour the mixture over the patties and potatoes.
Step 5: Slow Cook
Cover and cook:
LOW for 6–7 hours
or
HIGH for 3–4 hours
The potatoes should be tender and the gravy thick and rich.