In a large mixing bowl, combine first 8 ingredients (through Worcestershire sauce). Divide into six equal portions and form into patties.
In a medium skillet over medium-high heat, add 1 tbsp oil and sear 3 patties for 3-5 minutes per side. Remove to a plate and repeat with 1 tbsp oil and remaining patties.
Add remaining oil, onions, mushrooms, and more salt and pepper to taste. Cook for 7-10 minutes, stirring occasionally until mushrooms are cooked down and most of the moisture has cooked off. Add flour, cook for 2 minutes, and add chicken stock, stirring to combine.
Bring to a boil and immediately reduce to a low simmer. Submerge turkey patties into the gravy and simmer for 20 minutes.
Serve with rice and your favorite sides. Enjoy!
Recipe by This Cookin' Dad at https://thiscookindad.com/2015/10/turkey-salisbury-steak-with-mushroom-gravy/