Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Peel the sweet potato and cut it into 1/2-inch cubes. Toss with avocado oil, sea salt, and black pepper on the prepared baking sheet.
Roast the sweet potatoes for 20-25 minutes, tossing halfway through, until they are tender and caramelized on the edges.
While the potatoes roast, heat a large skillet over medium-high heat. Add the ground beef and cook until browned, breaking it up with a spatula as it cooks.
Drain any excess fat from the skillet, then stir in the minced garlic, minced ginger, sesame oil, and coconut aminos. Cook for 2-3 minutes until the sauce has thickened slightly and the beef is well-coated.
Add the fresh baby spinach to the skillet and toss gently with the beef until the leaves are just wilted.
Divide the roasted sweet potatoes into a bowl and top with the Korean beef and spinach mixture.
Garnish with sliced green onions and sesame seeds before serving.