Preheat your oven to 400°F (204°C) and line a baking sheet with parchment paper.
Dice the Yukon Gold potato into 1/2-inch cubes and toss them in a bowl with the extra virgin olive oil, half of the sea salt, and half of the black pepper.
Spread the potatoes in a single layer on the prepared baking sheet and roast for 25-30 minutes until they are golden-brown and tender.
While the potatoes roast, finely mince the yellow onion and the garlic clove.
In a medium mixing bowl, combine the ground beef, egg, almond flour, minced onion, minced garlic, dried thyme, and the remaining sea salt and black pepper.
Gently mix the ingredients by hand until just incorporated, taking care not to overwork the meat which can make it tough.
Form the beef mixture into a compact loaf shape and place it in a small parchment-lined baking dish.
Spread the tomato paste evenly over the top of the meatloaf to create a savory glaze.
Bake the meatloaf for 20-25 minutes until the internal temperature reaches 160°F (71°C).
Remove from the oven and let the meatloaf rest for 5 minutes before slicing and serving with the crispy roasted potatoes.