01 - Set the oven to 400°F. Line a baking sheet with parchment paper or spray lightly with nonstick spray.
02 - Arrange salmon fillets on the baking sheet. Drizzle with olive oil, then sprinkle salt and pepper evenly. Place a lemon slice atop each fillet.
03 - Bake the salmon for 12 to 15 minutes, until it flakes easily with a fork and reaches an internal temperature of 145°F.
04 - While baking, whisk together sour cream or Greek yogurt, mayonnaise, lemon juice, lemon zest, dill, garlic, salt, and black pepper in a small bowl until smooth.
05 - Remove salmon from oven, transfer fillets to plates, and spoon the lemon dill sauce over each fillet or serve alongside.
06 - Optionally, garnish with additional fresh dill or lemon wedges before serving.