Pat the salmon dry and season lightly with salt and pepper.
Heat a non-stick skillet over medium-high heat.
Sear the salmon skin-side down (if applicable) for about 3-4 minutes, then flip and cook for another 3-4 minutes until the interior is just opaque.
Meanwhile, steam the green beans in a steamer or a pot with a bit of water until they are crisp-tender, about 4-5 minutes.
In a small pan, heat the olive oil and add minced garlic; sauté until fragrant, about 30 seconds, then toss with the steamed green beans.
For the cauliflower mash, steam or boil the cauliflower florets until very soft, about 8-10 minutes.
Transfer the steamed cauliflower to a bowl and mash with a fork or blend lightly until smooth. Season with salt and pepper to taste.
Plate the seared salmon alongside a serving of garlic green beans and a generous scoop of cauliflower mash, and serve immediately.