Add the butter, olive oil, garlic, dijon mustard, honey, salt, pepper, fresh parsley and the zest and juice of one lemon into a large bowl. Mix until well combined then add the salmon filets and potatoes to coat in the lemon garlic marinade.
Lay parchment paper bag on a sheet pan. Add a layer of potatoes, then asparagus. Gently place your marinated salmon filets over the asparagus and top each filet with lemon slices. If your parchment is not able to fit all 4 filets, wrap each filet individually in a sheet of parchment with the potatoes and asparagus portioned accordingly.
Fold and scrunch the open edges of the parchment paper to ensure it is fully enclosed.
Bake for 15 minutes or until the internal temperature of the thickest part of your salmon reaches 145 degrees Fahrenheit.
Remove from the parchment paper and place on a serving dish. Serve immediately.
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