Combine ground beef, egg, almond flour, sea salt, black pepper, garlic powder, and onion powder in a large mixing bowl.
Gently mix by hand until just combined and form the mixture into 10 uniform meatballs.
Melt the ghee in a large skillet over medium-high heat.
Add the meatballs to the skillet and sear for 2-3 minutes per side until a golden-brown crust forms.
Remove the meatballs from the skillet and set them aside on a plate.
Add the sliced mushrooms to the same skillet and sauté for 5 minutes until they are softened and browned.
Pour in the beef bone broth and coconut aminos, using a wooden spoon to scrape up the flavorful browned bits from the bottom of the pan.
Return the meatballs to the pan, reduce the heat to medium-low, and simmer for 6 minutes until the gravy is slightly reduced and meatballs are cooked through.
Sprinkle with chopped fresh thyme before serving warm.