Place the ground beef, Worcestershire sauce, almond flour, parsley, garlic powder, onion powder, ½ teaspoon of salt and ¼ teaspoon of black pepper in a large bowl and mix to combine.
Shape into 6 patties and set aside.
Melt 2 tablespoons of butter in a large skillet.
Add the patties and brown, 3-5 minutes per side.
Remove the patties from the skillet and set aside.
Add the remaining butter.
Add the onion and mushrooms and cook, stirring occasionally, until softened and browned, 3 to 4 minutes.
In a bowl combine the beef broth and sour cream.
Season to taste with salt and black pepper.
Pour the broth mixture in the skillet and scrape the bottom of the pot with a wooden spoon to loosen the brown bits.
Return the patties into the skillet.
Cook for 10-15 minutes, stirring occasionally, until the sauce has thickened.