01 - Preheat your oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Pat salmon fillets dry with paper towels and place them skin-side down on the prepared baking sheet.
03 - In a small bowl, mix together the Cajun seasoning, paprika, garlic powder, onion powder, thyme, oregano, and cayenne pepper.
04 - Drizzle olive oil over the salmon fillets and rub it in gently.
05 - Sprinkle the seasoning mix evenly over each salmon fillet. Season with a little salt and black pepper as desired.
06 - Top each fillet with a lemon slice.
07 - Bake for 12–15 minutes, or until the salmon flakes easily with a fork and reaches an internal temperature of 145°F.
08 - Remove from the oven, garnish with fresh parsley, and serve immediately.