Preheat oven to 400°F. Line a two sheet pans with parchment paper.
Arrange potatoes on one of the prepared sheet pan, and drizzle with 2 tablespoons olive oil, ¾ teaspoon sea salt and 1 teaspoon chili powder. Toss the combine.
Bake for 15 minutes, until the potatoes are fork-tender.
While the potatoes bake, prepare the salmon and string beans. In a small bowl, combine chili powder, garlic powder, 1 teaspoon salt and 2 tablespoons olive oil.
On the second prepared sheet pan, arrange salmon fillets in the center of the baking sheet, and green beans around the salmon in a single layer.
Rub the seasoning mixture mostly over the salmon, saving a little to spread onto the string beans.
Bake for 8-10 minutes, or until salmon is cooked to your liking.
Optional: Turn on broiler to high; broil until salmon is golden, about 2 minutes.