Gently place the seared patties into the sauce. Cover and let it simmer for about 5-10 minutes for the Salisbury steak to finish cooking and the gluten-free mushroom gravy to thicken.
Notes
Tips for making the best gluten-free Salisbury steak
DO NOT over-mix the meat - The more you mess with the meat, the tougher the patties will become, and you do not want them to become tough. Salisbury steak is meant to be tender and soft and melt in your mouth.
Shaping the gluten-free ground beef. - This goes with the above and not to overmix. When you shape the patties. (I usually do an oval-ish shape). You want to form the patties and make sure they will stay together, but you do not want to be fully compacting them like you if you were to use some of the hamburger-type presses.
Searing the gluten-free Salisbury steak patties. - For optimal flavor and color, searing will be your best friend. To accomplish this, you need to let the patties cook (undisturbed) until the patty no longer looks pink for the most part before you flip it over to the other side. Sear the meat before mushrooms and onion.