Preheat oven to 400 degrees Fahrenheit.
Place salmon and asparagus on a foil-lined baking sheet and pat the salmon dry.
Drizzle olive oil and garlic salt on the asparagus.
Combine butter, garlic, rosemary, thyme, and parsley and spread on the salmon.
Then place the lemon slices on the salmon and bake in the oven for 15 minutes!