Set your oven to 400°F (200°C). Toss the sweet potato cubes and broccoli florets in 1 tablespoon of olive oil, seasoning lightly with salt and pepper before spreading them evenly on a large baking sheet.
Combine the remaining olive oil with lemon juice, turmeric, grated ginger, minced garlic, dried thyme, salt, and pepper in a small bowl, whisking until well mixed.
Arrange the salmon fillets on the baking sheet alongside the veggies and brush the turmeric-ginger marinade generously over each piece.
Place the sheet in the oven and roast everything together for 15 to 20 minutes, until the salmon flakes easily and the vegetables are soft with a bit of caramelization.
Transfer the salmon, broccoli, and sweet potatoes carefully onto plates and serve warm.