POTATOES: Position a rack in the center of the oven and preheat the oven to 425ºF. Line a large sheet pan with parchment paper or foil. In a medium bowl, melt 2 tablespoons of butter. Add the oil, ¼ teaspoon kosher salt, ¼ teaspoon black pepper, and 2 teaspoons minced garlic and stir to combine. Toss potatoes in this mixture then transfer to the sheet pan and spread the potatoes out. Roast the potatoes for 20 minutes.

SALMON + ASPARAGUS: While potatoes are roasting, add the remaining softened butter to a small bowl, add ¼ teaspoon black pepper, minced garlic, red pepper flakes, lemon zest, lemon juice, parsley, and stir to combine. When the potatoes are done, push to one side of the sheet pan. Place the asparagus on the other side. Place the salmon fillets in the center and make sure to pat the flesh dry. Then, place a tablespoon of the prepared butter on each fillet and spread with a knife. Dollop the remaining butter mixture over asparagus.

BAKE: Top salmon with lemon slices, if desired. Place the sheet pan back in the oven for about 9-10 minutes. When the salmon is done, check to make sure it registers at least 145ºF on a meat thermometer. I like to hit the broil setting for a quick 30-60 seconds to give it a bit more color but that is optional. Serve warm!