Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper for easy cleanup.
Halve the mini potatoes and toss them directly on the baking sheet with avocado oil and half of the sea salt and black pepper.
Roast the potatoes for 20-25 minutes, tossing halfway through, until they are golden brown and tender.
While potatoes roast, heat a large stainless steel or cast iron skillet over medium-high heat and add the ground beef.
Cook the beef for 5-7 minutes, breaking it into small crumbles with a spatula, until it is thoroughly browned.
Add the diced yellow onion to the skillet with the beef and sauté for another 4 minutes until the onion is soft and translucent.
Stir in the minced garlic, dried rosemary, and dried thyme along with the remaining salt and pepper, cooking for 60 seconds until fragrant.
Remove the roasted potatoes from the oven and fold them into the beef and onion mixture until well combined.
Serve immediately while hot and garnish with fresh parsley if desired.