Preheat the oven to 375°F (190°C).
Season the salmon with olive oil, salt, pepper, and a squeeze of lemon.
Bake for 15–18 minutes, or until fully cooked.
Meanwhile, roast sweet potato cubes with a drizzle of olive oil and sea salt for about 20 minutes, flipping halfway.
In a bowl, layer spinach, roasted sweet potato, and avocado.
Top with baked salmon, drizzle with olive oil and extra lemon juice.