Preheat the oven to 400°F.
Place the salmon fillet on a lined baking sheet, season lightly with salt and pepper.
Trim and halve the Brussels sprouts, toss with a little olive oil, salt, and pepper, then spread them out on a second baking sheet.
Roast the Brussels sprouts in the oven for about 20-25 minutes until tender and slightly crispy on the edges.
Bake the salmon in the oven for approximately 12-15 minutes or until it flakes easily with a fork.
Meanwhile, steam the cauliflower florets until very tender (about 10 minutes).
In a bowl, combine the steamed cauliflower, garlic (minced or roasted from a lightly tossed garlic clove with the sprouts), and Greek yogurt. Blend or mash until creamy. Stir in 2 teaspoons olive oil and season with salt and pepper to taste.
Plate the baked salmon alongside a serving of roasted Brussels sprouts and a generous scoop of garlic mashed cauliflower.
Serve warm and enjoy your wholesome, nutrient-packed dinner!