Tonight will be my 3rd time making this recipe. It’s so good, and the sauce is to die for

For the patties:
1 1/2 pounds ground beef
1 egg
1/4 cup minced onion
1/4 cup breadcrumbs
1 clove garlic, crushed
1/2 teaspoon salt
1/4 teaspoon pepper
For the gravy:
1 small onion, sliced
6 ounces mushrooms, sliced
1 1/2 cups beef broth
1 package brown gravy mix
1 tablespoon ketchup (optional)
1 tablespoon Dijon mustard (optional)
2 tablespoons cornstarch
Directions

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