Preheat your oven to 400 degrees f. and line a large sheet pan with parchment paper.
Place your sweet potato slices on the prepared pan and spray or mist lightly with cooking oil.
Season with sea salt and pepper, to taste.
Roast for 15-18 minutes, or until just beginning to become tender.
Meanwhile, in a small saucepan, add the maple syrup, vinegar, butter, mustard, garlic, and pepper flakes.
Simmer for 3-4 minutes while whisking constantly, or until it's reduced by half and thickened a bit.
Once your potatoes are done, remove from the oven, flip potatoes over, and create some space on your sheet pan for the salmon filets.
Baste the salmon generously with your maple-mustard glaze and roast for 10-12 minutes, or just until the salmon is flaky and the sweet potatoes are golden-brown.