Preheat and Prep: Preheat your oven to 400°F (200°C). Line a baking dish with parchment paper or lightly grease with olive oil.
Season the Salmon: In a small bowl, mix olive oil, lemon juice, lemon zest, minced garlic, oregano, paprika, salt, and pepper. Brush this mixture generously over the salmon fillets.
Bake: Place the seasoned salmon in the baking dish and bake for 12–15 minutes, or until the salmon is cooked through and flakes easily with a fork. Sprinkle feta over the salmon during the last 3 minutes of baking for a warm, melty topping.
Make the Salad: While the salmon is baking, combine cucumber, cherry tomatoes, red onion, olives, feta, and herbs in a large bowl. Drizzle with olive oil and red wine vinegar or lemon juice. Toss to coat. Adjust salt and pepper to taste.
Serve: Plate each salmon fillet with a generous scoop of cucumber salad. Garnish with extra herbs if desired and serve immediately.