Preheat your oven to 400°F (200°C). In a small bowl, combine olive oil, minced garlic, chopped dill, parsley, lemon zest, lemon juice, salt, and pepper.
Place the salmon on a parchment-lined baking sheet and brush the herb mixture generously over the fish. The acid from the lemon actually begins the cooking process, creating a more tender result.
Place the seasoned salmon in the preheated oven and bake for 10-12 minutes, or until it flakes easily with a fork but remains moist in the center. For optimal texture, aim for an internal temperature of 145°F (63°C).
While the salmon bakes, assemble your salad base. Combine the mixed greens, cucumber, cherry tomatoes, red onion, and olives in a large serving bowl. Pro tip: If red onions are too sharp for your taste, soak the sliced onions in ice water for 10 minutes before adding them to your salad.
In a small jar with a tight-fitting lid, combine olive oil, lemon juice, Dijon mustard, fresh herbs, minced garlic, salt, and pepper. Shake vigorously until emulsified.
Allow the cooked salmon to cool slightly, then gently flake it into bite-sized pieces. Add the flaked salmon to the salad base, followed by the feta cheese and capers.
Drizzle the lemon herb dressing over the salad just before serving and toss gently to coat all ingredients. Serve immediately for the perfect balance of textures and temperatures.