01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Place salmon fillets skin-side down on the baking sheet. Brush with olive oil, season with salt and black pepper, then top each with lemon slices.
03 - Bake for 15 to 20 minutes until the salmon easily flakes with a fork and is opaque in the center.
04 - While salmon bakes, combine Greek yogurt, diced cucumber, dill, lemon juice, garlic, salt, and pepper in a bowl. Mix thoroughly and refrigerate until serving.
05 - Remove salmon from oven, plate each fillet, spoon cucumber yogurt sauce on top or serve alongside. Garnish with dill sprigs and lemon wedges if desired.