Peel and cube the sweet potato, then boil in a pot of water until tender, about 10-12 minutes.
Drain the sweet potato and mash until smooth, adding a splash of water or vegetable broth if needed for consistency.
Pat the salmon fillet dry with a paper towel and season both sides with salt and pepper.
Heat one teaspoon of olive oil in a non-stick skillet over medium-high heat.
Place the salmon in the pan skin-side down and sear for 4-5 minutes until the skin is crispy.
Flip the salmon and cook for another 3-4 minutes until cooked through to your preference, then remove from the pan.
In the same skillet, add the remaining half teaspoon of olive oil and the minced garlic, sautéing for 30 seconds until fragrant.
Add the spinach to the skillet and toss until just wilted, about 1-2 minutes.
Plate the sweet potato mash, top with the salmon, and serve the garlic spinach on the side with a fresh lemon wedge.