Melt the butter in a medium saucepan over medium heat.
Add the dry orzo and toast it in the butter for 2–3 minutes, stirring frequently so it does not burn.
Pour in the chicken or vegetable stock and add a pinch of kosher salt and pepper; bring to a boil.
Reduce heat to a simmer, cover, and cook for 12–15 minutes, stirring once or twice, until the liquid is absorbed and orzo is tender.
Stir in the grated Parmesan, lemon juice, and lemon zest; taste and adjust seasoning with salt and pepper as needed.
In a small bowl, combine the dried parsley, dried minced garlic, garlic powder, crushed red pepper, 1/2 teaspoon salt, and 1/2 teaspoon pepper to make the salmon seasoning.
Pat the salmon filets dry with paper towels and season both sides evenly with the prepared seasoning.
Heat 1–2 tablespoons olive oil in a skillet over medium heat until shimmering. Add the salmon, presentation side down, and sear for 2–3 minutes.
Carefully flip the salmon and cook for another 3–5 minutes, or until the fish is opaque through the center and flakes easily with a fork.
Serve the seared salmon atop the lemon Parmesan orzo and garnish with chopped fresh parsley.