Pat the salmon dry and season both sides with salt and pepper.
Heat the olive oil in a nonstick skillet over medium-high heat until shimmering.
Place the salmon skin-side down (if applicable) and sear for about 3-4 minutes, then flip and cook for an additional 3 minutes or until desired doneness is reached.
Meanwhile, steam the green beans until tender-crisp, about 4-5 minutes. In a separate saucepan, steam the cauliflower florets until soft, approximately 8-10 minutes.
While the cauliflower is steaming, lightly sauté the minced garlic in a small pan with a tiny drizzle of olive oil until fragrant, about 1 minute.
Transfer the steamed cauliflower to a bowl, add butter and the sautéed garlic, then mash until smooth. Season with salt and pepper to taste.
Toss the steamed green beans with a pinch of salt and a drizzle of olive oil.
Plate by placing a generous serving of mashed cauliflower, arranging the green beans alongside, and topping with the seared salmon.
Garnish with a final drizzle of olive oil and a sprinkle of freshly ground black pepper, then serve immediately.