Preheat your oven to 400°F and line a baking sheet with parchment paper.
Dice the yellow potato into half-inch cubes and toss with half of the avocado oil and a pinch of sea salt.
Spread the potatoes on the baking sheet and roast for 20-25 minutes until the edges are golden and crisp.
While the potatoes roast, heat the remaining avocado oil in a large skillet over medium-high heat.
Add the diced onions and sliced mushrooms to the skillet, sautéing for 5 minutes until soft and slightly browned.
Add the ground beef to the skillet, breaking it into small crumbles with a wooden spoon, and cook until fully browned.
Season the beef and vegetable mixture with sea salt, black pepper, and garlic powder.
In a small jar or bowl, whisk the arrowroot starch into the cold beef bone broth until no lumps remain.
Pour the broth mixture into the skillet and bring to a gentle simmer, stirring constantly for 2 minutes until the gravy thickens.
Place the roasted potatoes in a bowl, top with the beef and gravy mixture, and garnish with freshly chopped parsley.