Preheat oven to 400F and line a baking sheet with parchment paper
Combine dijon mustard, maple syrup, and soy sauce (or coconut aminos) in a small mixing bowl
Trim ends off brussels sprouts and cut into small pieces (quarters or sixths)
Arrange salmon fillets and cut brussels sprouts on the baking sheet with the salmon in the center and the brussels sprouts surrounding the salmon
Brush the salmon with a generous amount of the maple dijon marinade
Drizzle the remainder of the sauce over the brussels sprouts and toss them to coat
Season the salmon and sprouts with salt and fresh cracked black pepper
Bake in the oven at 400F for 10 minutes
Increase the oven heat to broil and bake for an additional 10 minutes
Remove from the oven and enjoy with rice, cauliflower rice, or quinoa