Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Cut the sweet potato into 1/2-inch thick wedges and toss them on the baking sheet with 0.5 tbsp of olive oil, 0.25 tsp salt, and half of the black pepper.
Roast the sweet potatoes for 22-25 minutes, flipping once halfway through, until they are tender and the edges are golden brown.
While the potatoes roast, pat the haddock fillets dry with paper towels to ensure a clean sear.
Season the fish on both sides with garlic powder, dried oregano, and the remaining salt and pepper.
Heat the remaining 0.5 tbsp of olive oil in a large non-stick skillet over medium-high heat.
Place the haddock in the skillet and sear for 3-4 minutes per side until the fish is opaque and flakes easily with a fork.
Steam the broccoli florets in a steamer basket over boiling water for 4-5 minutes until they are bright green and tender-crisp.
Serve the haddock immediately with a fresh squeeze of lemon juice, the roasted sweet potatoes, and the steamed broccoli.