Heat the butter in a large skillet over medium-high heat.
Season the salmon fillets with salt and pepper.
Place the salmon skin-side up in the skillet and cook for 3–5 minutes until golden brown.
Flip the salmon and cook another 3–4 minutes, or until it reaches an internal temperature of 145°F (63°C).
Remove the salmon from the skillet and loosely cover with foil.
Reduce the heat to medium.
Whisk together the orange juice, honey, soy sauce, garlic, and optional cornstarch slurry.
Pour the sauce into the same skillet and cook for 30–60 seconds until slightly thickened.
Return the Orange Glazed Salmon to the skillet and spoon the glaze over each fillet.
Garnish with fresh orange slices and serve immediately.