01 - Set oven to 400°F and prepare a baking sheet with parchment paper or a light coating of nonstick spray.
02 - Arrange salmon fillets on the baking sheet, drizzle with olive oil, then season evenly with salt and pepper. Place a lemon slice on each fillet.
03 - Bake for 12 to 15 minutes until the salmon flakes easily with a fork and reaches 145°F internal temperature.
04 - 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 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.