Preheat your oven to 400°F (200°C).
Trim and halve the brussels sprouts, then toss them on a baking sheet with 1 teaspoon of olive oil, salt, and pepper.
Roast the sprouts for 20-25 minutes, shaking the pan halfway through, until they are charred and crispy.
While the sprouts roast, peel and cube the sweet potato and place in a pot of boiling water.
Boil the sweet potato for 12-15 minutes until fork-tender, then drain and mash until smooth, adding a pinch of salt.
Season the salmon fillet with salt and pepper on both sides.
Heat the remaining 1 teaspoon of olive oil in a non-stick skillet over medium-high heat.
Place the salmon in the pan and sear for 4-5 minutes per side until the internal temperature reaches 145°F and the surface is golden.
Serve the salmon over the sweet potato mash with the roasted sprouts on the side and a fresh lemon wedge.