In a medium bowl, combine the ground chuck, egg, almond flour, sea salt, black pepper, garlic powder, and onion powder until just incorporated.
Roll the mixture into approximately 6 to 8 uniform meatballs.
Heat the olive oil in a large skillet over medium-high heat and sear the meatballs until browned on all sides, then remove them from the pan.
Add the sliced mushrooms to the same skillet and sauté for 3-4 minutes until they release their moisture and soften.
In a small jar, whisk together the beef bone broth and arrowroot powder until no clumps remain.
Pour the broth mixture into the skillet with the mushrooms, stirring constantly as the sauce begins to thicken into a velvety gravy.
Return the meatballs to the skillet, reduce heat to low, and simmer for 5 minutes until cooked through.
Garnish with chopped fresh parsley before serving.