Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Peel and cube the sweet potato into half-inch pieces, then toss them on the pan with half of the olive oil and a pinch of sea salt.
Roast the sweet potatoes for 10 minutes to give them a head start on caramelizing.
While the potatoes roast, combine the dried parsley, dried dill, garlic powder, sea salt, and black pepper in a small bowl.
Pat the salmon fillet dry with a paper towel, brush with the remaining olive oil, and evenly press the herb mixture onto the top of the fish.
Remove the pan from the oven, move the potatoes to one side, and place the salmon and trimmed green beans on the other side.
Return the pan to the oven and roast for another 12 to 15 minutes until the salmon is flaky and the green beans are vibrant and tender.
Finish the dish with a fresh squeeze of lemon juice over the salmon before serving.