Preheat your oven to 425°F (220°C).
Prepare the Brussels sprouts by trimming the ends and halving them. Toss with a little olive oil, salt, and pepper, then spread on a baking sheet.
Place the Brussels sprouts in the preheated oven and roast for 18-20 minutes until tender and slightly crispy.
Meanwhile, peel and cube the potato. Boil in lightly salted water until tender, about 15 minutes.
In a small pan over medium-high heat, warm a drizzle of olive oil. Season the salmon fillet with salt, pepper, and garlic powder.
Place the salmon skin-side down in the pan and cook for about 3-4 minutes until the skin is crispy. Flip and cook for an additional 2-3 minutes until desired doneness.
Drain the potatoes and mash them with low-fat milk, a small drizzle of olive oil, salt, and pepper until creamy.
Plate the dish by layering the mashed potatoes, placing the crispy salmon on top, and adding a side of roasted Brussels sprouts. Serve immediately.