01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - Place salmon fillets on the prepared baking sheet. Brush with olive oil, season with salt and black pepper, and top each with a lemon slice.
03 - Bake fillets for 15 to 18 minutes, until cooked through and flakes easily with a fork.
04 - While salmon bakes, whisk sour cream, mayonnaise, lemon juice, dill, Dijon mustard, garlic, salt, and pepper in a small bowl until smooth.
05 - Remove salmon from oven, discard lemon slices if desired, and serve warm topped generously with dill sauce.