Preheat the oven to 400°F.
Rinse and trim the Brussels sprouts, then toss them with olive oil, salt, and pepper. Spread them on a baking sheet.
Roast the Brussels sprouts in the oven for 20-25 minutes, until tender and slightly crispy on the edges.
While the Brussels sprouts are roasting, season the salmon fillet with salt and pepper.
In a small bowl, mix the maple syrup and a pinch of salt. Brush this glaze over the salmon fillet.
Heat a non-stick skillet over medium-high heat and sear the salmon, skin-side down if applicable, for about 2 minutes to develop a crust.
Transfer the salmon to the oven and bake for an additional 8-10 minutes until cooked through and flaky.
Reheat the already cooked quinoa if needed and fluff with a fork.
Plate the salmon alongside a serving of roasted Brussels sprouts and a scoop of quinoa. Drizzle any remaining glaze or juices over the top for extra flavor.