01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or lightly grease it.
02 - In a small bowl, combine softened butter, chopped dill, lemon juice, lemon zest, minced garlic, salt, and pepper. Mix until smooth.
03 - Place salmon fillets on the prepared baking sheet, skin side down.
04 - Spread the lemon-dill butter evenly over the tops of the fillets.
05 - Bake for 15 to 18 minutes, until the salmon is opaque and flakes easily with a fork.
06 - Serve immediately, garnished with lemon slices and dill sprigs if desired.