In a large bowl, mix together ground beef, egg white, onion, cracker crumbs, milk, salt and pepper. Use your hands to be sure everything is mixed evenly.
Form 10 oval shaped patties from the meat mixture.
Brown both sides of patties on the grill, just enough to get those fabulous grill marks on both sides. You can also brown them in a skillet if you prefer.
In the Oven
Place grilled patties into a 13x9x2 baking pan and cover with gravy. Cover the pan tightly with aluminum foil. Bake in a preheated 375 F oven for 25 minutes. After removing from the oven, allow to rest for ten minutes before removing the foil cover and serving.
On the Stovetop
Place grilled patties in a large skillet and over with gravy. Bring to a boil then reduce heat, cover and simmer for 25 minutes. Turn off heat and allow to rest for ten minutes before removing the cover and serving.
In the Slow Cooker
Place grilled patties in the slow cooker crock and cover with gravy. Cook on low for 6-8 hours. Remove patties from gravy, tent with foil and set aside. Spoon off any excess fat from gravy. Turn slow cooker on high to thicken gravy if needed.
When to Add Mushrooms
You can add your mushrooms to any of the pans and allow them to cook in the gravy. I prefer that my mushrooms not be completely soft, so I saute them in a skillet and add them to the gravy just before serving.
COOK TIMES reflect oven and stovetop methods.NOTE: Nutritional information does not include gravy.