01 - Preheat the oven to 400°F and line a baking sheet with parchment paper or lightly grease it.
02 - Pat salmon fillets dry with paper towels and place skin-side down on the prepared baking sheet.
03 - Drizzle olive oil over the fillets, then season evenly with kosher salt and black pepper.
04 - Place a lemon slice on each fillet and bake in the preheated oven for 12 to 15 minutes until salmon flakes easily with a fork.
05 - In a small bowl, combine softened butter, chopped dill, lemon zest, minced garlic, and salt; mash together until smooth.
06 - Remove salmon from oven and immediately spread a generous dollop of dill butter on each fillet, allowing it to melt over the hot fish.
07 - Serve immediately, optionally garnished with extra dill or lemon wedges.