Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
Prepare the fish by patting the steelhead trout dry with paper towels.
Season the fillets with salt, black pepper, paprika, and minced garlic.
Add fat by brushing olive oil or melted butter evenly over both fillets.
Place on baking sheet skin-side down and arrange lemon slices on top.
Bake for 12–15 minutes until the fish is flaky and fully cooked.
Finish with flavor by adding fresh lemon juice, zest, and chopped herbs.
Rest for 2–3 minutes before serving for best texture and juiciness.