Begin by preparing the creamy mashed potatoes. Peel the potatoes and cut them into evenly sized chunks. Boil in salted water until fork-tender, about 15-20 minutes.
Drain the potatoes and return them to the pot. Add the heavy cream, butter, and whole milk. Mash until completely smooth and season with salt and pepper to taste.
Next, prepare the garlic green beans. Trim the ends of the green beans and rinse them thoroughly. In a skillet, heat the olive oil over medium heat and add the minced garlic. Sauté for about 1 minute until fragrant.
Add the green beans to the skillet and sauté for approximately 5-7 minutes until they are tender yet still crisp. Season lightly with salt.
For the salmon, pat the fillet dry with paper towels and season both sides with salt and pepper.
Heat a non-stick skillet over medium-high heat. Once hot, add the salmon skin-side down and sear for about 4-5 minutes until a golden crust forms.
Carefully flip the salmon and cook for an additional 3-4 minutes, or until the salmon flakes easily with a fork.
Plate the dish by placing a generous serving of creamy mashed potatoes, a portion of garlic green beans, and the seared salmon fillet. Serve immediately and enjoy your nutritious dinner.