Step 1: Preheat and Prep : Preheat oven to 400°F (200°C). Line a large baking sheet with parchment paper for easy cleanup.
Step 2: Prepare the Brussels Sprouts : In a mixing bowl, toss Brussels sprouts with olive oil, salt, pepper, and chili flakes (if using). Spread them evenly on one side of the prepared baking sheet, cut side down for maximum crispiness.
Step 3: Make the Maple Dijon Glaze : In a small bowl, whisk together maple syrup, Dijon mustard, soy sauce, garlic, olive oil, and apple cider vinegar. Adjust seasoning with salt and pepper to taste.
Step 4: Prepare the Salmon : Pat salmon fillets dry with a paper towel and season lightly with salt and pepper. Place the fillets on the other half of the baking sheet. Spoon or brush the Maple Dijon glaze generously over each piece of salmon.
Step 5: Bake Everything Together : Roast in the preheated oven for 15–18 minutes, or until the salmon flakes easily with a fork and the Brussels sprouts are crisp and tender. For a caramelized finish, broil the salmon for 2–3 minutes at the end, watching closely to avoid burning.
Step 6: Finish and Serve : Transfer salmon and Brussels sprouts to serving plates. : Drizzle any extra glaze from the pan over the top. Garnish with chopped parsley or thyme and serve with fresh lemon wedges for brightness.