Pat the salmon fillet dry and season both sides with salt, pepper, and a pinch of garlic powder.
Heat a non-stick skillet over medium-high heat, adding the olive oil when hot.
Place the salmon in the skillet skin-side down if applicable, and sear for about 3-4 minutes; then flip and cook for another 3-4 minutes until the salmon is opaque and flakes easily.
While the salmon is cooking, steam the green beans until tender-crisp, about 4-5 minutes.
Meanwhile, steam the cauliflower florets until soft, about 8-10 minutes, then transfer to a bowl.
Mash the steamed cauliflower with a fork or immersion blender, adding salt, pepper, and a drizzle of olive oil if desired for extra creaminess.
Plate the seared salmon with a side of steamed green beans and a serving of cauliflower mash, and enjoy your nutritious dinner.