Pat the salmon fillet dry and season both sides with salt and pepper.
Heat a non-stick skillet over medium-high heat and add a drizzle of olive oil.
Once the oil shimmers, place the salmon skin-side down (if applicable) and sear for about 3-4 minutes, then flip and cook for another 3-4 minutes until cooked through.
Meanwhile, bring a small pot of water to a boil. Add the green beans and blanch for 3-4 minutes until tender-crisp, then drain.
In another pot, steam the cauliflower florets for about 8-10 minutes until very soft.
Combine the steamed cauliflower with 1 tablespoon of olive oil, minced garlic, salt, and pepper. Mash until smooth and adjust seasonings to taste.
Optionally, toss the blanched green beans with a touch of olive oil, minced garlic, salt, and pepper in a skillet for an extra burst of flavor.
Plate the seared salmon alongside the garlic green beans and a generous scoop of cauliflower mash, then serve warm.