01 - Preheat oven to 400°F. Line a large baking sheet with parchment paper or foil for easy cleanup.
02 - Arrange salmon fillets on one half of the baking sheet. In a small bowl, whisk together melted butter, lemon juice, lemon zest, garlic, parsley, dill, salt, and pepper. Pour mixture evenly over the salmon.
03 - Spread asparagus in an even layer on the other half of the baking sheet. Drizzle with olive oil, sprinkle with salt and pepper, and toss to coat.
04 - Bake for 15-18 minutes, or until salmon flakes easily with a fork and asparagus is tender.
05 - Remove from oven. Garnish salmon and asparagus with lemon slices and extra parsley before serving.