Peel and cube the sweet potato, then boil in water for 12-15 minutes until tender.
Drain the sweet potato and mash thoroughly until smooth, seasoning with a pinch of salt and pepper.
Pat the salmon fillet dry with a paper towel and season both sides with salt.
Heat half of the olive oil in a non-stick skillet over medium-high heat.
Place the salmon in the pan skin-side up and sear for 4-5 minutes until golden brown.
Flip the salmon and cook for another 3-4 minutes until the internal temperature reaches 145°F.
Remove the salmon from the pan and let it rest.
In the same skillet, add the remaining olive oil and the minced garlic, sautéing for 30 seconds until fragrant.
Add the baby spinach to the pan and toss until just wilted, about 1-2 minutes.
Plate the sweet potato mash, top with the garlic spinach, and place the seared salmon on top.