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

Prepare Patties: Combine all patty ingredients in a bowl. Form the mixture into small patties, each about 3/4 inch thick.

Layer Veggies in Slow Cooker: Place a bed of sliced onions and mushrooms at the bottom of the slow cooker.

Brown Patties: In a skillet, brown the patties on both sides to enhance their flavor. Then, place them over the onions and mushrooms in the slow cooker. (Alternatively, you can place raw patties directly into the slow cooker, but browning is recommended for better flavor.)

Prepare Gravy: Mix beef broth, gravy mix, ketchup, and mustard (if using) in a separate bowl. Pour this mixture over the meat and vegetables in the slow cooker.

Slow Cook: Cover and cook on low for 5 hours.